Isotope filter animation bug

Recently, I started using isotope filter for my website. It worked fine, until I added some border and translate transition to it. After that, filter blocks started to work strange. After sorting animation, blocks go from left to right until it reaches its position. Here is a link https://codepen.io/Incognitus/pen/dKVEyz

    <h1>Isotope - filtering</h1>
    <div class="button-group filters-button-group">
    <button class="button is-checked" data-filter="*">show all</button>
    <button class="button" data-filter=".metal">metal</button>
  <button class="button" data-filter=".transition">transition</button>
  <button class="button" data-filter=".alkali, .alkaline-earth">alkali and alkaline-earth</button>
  <button class="button" data-filter=":not(.transition)">not transition</button>
  <button class="button" data-filter=".metal:not(.transition)">metal but not transition</button>
  <button class="button" data-filter="numberGreaterThan50">number > 50</button>
  <button class="button" data-filter="ium">name ends with &ndash;ium</button>
</div>

<div class="grid">
  <div class="element-item transition metal " data-category="transition">
    <h3 class="name">Mercury</h3>
    <p class="symbol">Hg</p>
    <p class="number">80</p>
    <p class="weight">200.59</p>
  </div>
  <div class="element-item metalloid " data-category="metalloid">
    <h3 class="name">Tellurium</h3>
    <p class="symbol">Te</p>
    <p class="number">52</p>
    <p class="weight">127.6</p>
  </div>
  <div class="element-item post-transition metal " data-category="post-transition">
    <h3 class="name">Bismuth</h3>
    <p class="symbol">Bi</p>
    <p class="number">83</p>
    <p class="weight">208.980</p>
  </div>
  <div class="element-item post-transition metal " data-category="post-transition">
    <h3 class="name">Lead</h3>
    <p class="symbol">Pb</p>
    <p class="number">82</p>
    <p class="weight">207.2</p>
  </div>
  <div class="element-item transition metal " data-category="transition">
    <h3 class="name">Gold</h3>
    <p class="symbol">Au</p>
    <p class="number">79</p>
    <p class="weight">196.967</p>
  </div>
  <div class="element-item alkali metal " data-category="alkali">
    <h3 class="name">Potassium</h3>
    <p class="symbol">K</p>
    <p class="number">19</p>
    <p class="weight">39.0983</p>
  </div>
  <div class="element-item alkali metal " data-category="alkali">
    <h3 class="name">Sodium</h3>
    <p class="symbol">Na</p>
    <p class="number">11</p>
    <p class="weight">22.99</p>
  </div>
  <div class="element-item transition metal " data-category="transition">
    <h3 class="name">Cadmium</h3>
    <p class="symbol">Cd</p>
    <p class="number">48</p>
    <p class="weight">112.411</p>
  </div>
  <div class="element-item alkaline-earth metal " data-category="alkaline-earth">
    <h3 class="name">Calcium</h3>
    <p class="symbol">Ca</p>
    <p class="number">20</p>
    <p class="weight">40.078</p>
  </div>
  <div class="element-item transition metal " data-category="transition">
    <h3 class="name">Rhenium</h3>
    <p class="symbol">Re</p>
    <p class="number">75</p>
    <p class="weight">186.207</p>
  </div>
  <div class="element-item post-transition metal " data-category="post-transition">
    <h3 class="name">Thallium</h3>
    <p class="symbol">Tl</p>
    <p class="number">81</p>
    <p class="weight">204.383</p>
  </div>
  <div class="element-item metalloid " data-category="metalloid">
    <h3 class="name">Antimony</h3>
    <p class="symbol">Sb</p>
    <p class="number">51</p>
    <p class="weight">121.76</p>
  </div>
  <div class="element-item transition metal " data-category="transition">
    <h3 class="name">Cobalt</h3>
    <p class="symbol">Co</p>
    <p class="number">27</p>
    <p class="weight">58.933</p>
  </div>
  <div class="element-item lanthanoid metal inner-transition " data-category="lanthanoid">
    <h3 class="name">Ytterbium</h3>
    <p class="symbol">Yb</p>
    <p class="number">70</p>
    <p class="weight">173.054</p>
  </div>
  <div class="element-item noble-gas nonmetal " data-category="noble-gas">
    <h3 class="name">Argon</h3>
    <p class="symbol">Ar</p>
    <p class="number">18</p>
    <p class="weight">39.948</p>
  </div>
  <div class="element-item diatomic nonmetal " data-category="diatomic">
    <h3 class="name">Nitrogen</h3>
    <p class="symbol">N</p>
    <p class="number">7</p>
    <p class="weight">14.007</p>
  </div>
  <div class="element-item actinoid metal inner-transition " data-category="actinoid">
    <h3 class="name">Uranium</h3>
    <p class="symbol">U</p>
    <p class="number">92</p>
    <p class="weight">238.029</p>
  </div>
  <div class="element-item actinoid metal inner-transition " data-category="actinoid">
    <h3 class="name">Plutonium</h3>
    <p class="symbol">Pu</p>
    <p class="number">94</p>
    <p class="weight">(244)</p>
  </div>
</div>

* { box-sizing: border-box; }

body {
  font-family: sans-serif;
}

/* ---- button ---- */

.button {
  display: inline-block;
  padding: 10px 18px;
  margin-bottom: 10px;
  background: #EEE;
  border: none;
  border-radius: 7px;
  background-image: linear-gradient( to bottom, hsla(0, 0%, 0%, 0), hsla(0, 0%, 0%, 0.2) );
  color: #222;
  font-family: sans-serif;
  font-size: 16px;
  text-shadow: 0 1px white;
  cursor: pointer;
}

.button:hover {
  background-color: #8CF;
  text-shadow: 0 1px hsla(0, 0%, 100%, 0.5);
  color: #222;
}

.button:active,
.button.is-checked {
  background-color: #28F;
}

.button.is-checked {
  color: white;
  text-shadow: 0 -1px hsla(0, 0%, 0%, 0.8);
}

.button:active {
  box-shadow: inset 0 1px 10px hsla(0, 0%, 0%, 0.8);
}

/* ---- button-group ---- */

.button-group:after {
  content: '';
  display: block;
  clear: both;
}

.button-group .button {
  float: left;
  border-radius: 0;
  margin-left: 0;
  margin-right: 1px;
}

.button-group .button:first-child { border-radius: 0.5em 0 0 0.5em; }
.button-group .button:last-child { border-radius: 0 0.5em 0.5em 0; }

/* ---- isotope ---- */

.grid {
  border: 1px solid #333;
}

/* clear fix */
.grid:after {
  content: '';
  display: block;
  clear: both;
}

/* ---- .element-item ---- */

.element-item {
  position: relative;
  float: left;
  width: 100px;
  height: 100px;
  margin: 5px;
  padding: 10px;
  background: #888;
  color: #262524;
  box-model:border-box;
  transition: transform 0.1s ease-in-out, border 0.1s ease-in-out;
}

.element-item:hover {
  transform: translate(0px, -7px);
    border: 2px solid orange;
}

.element-item > * {
  margin: 0;
  padding: 0;
}

.element-item .name {
  position: absolute;

  left: 10px;
  top: 60px;
  text-transform: none;
  letter-spacing: 0;
  font-size: 12px;
  font-weight: normal;
}

.element-item .symbol {
  position: absolute;
  left: 10px;
  top: 0px;
  font-size: 42px;
  font-weight: bold;
  color: white;
}

.element-item .number {
  position: absolute;
  right: 8px;
  top: 5px;
}

.element-item .weight {
  position: absolute;
  left: 10px;
  top: 76px;
  font-size: 12px;
}

.element-item.alkali          { background: #F00; background: hsl(   0, 100%, 50%); }
.element-item.alkaline-earth  { background: #F80; background: hsl(  36, 100%, 50%); }
.element-item.lanthanoid      { background: #FF0; background: hsl(  72, 100%, 50%); }
.element-item.actinoid        { background: #0F0; background: hsl( 108, 100%, 50%); }
.element-item.transition      { background: #0F8; background: hsl( 144, 100%, 50%); }
.element-item.post-transition { background: #0FF; background: hsl( 180, 100%, 50%); }
.element-item.metalloid       { background: #08F; background: hsl( 216, 100%, 50%); }
.element-item.diatomic        { background: #00F; background: hsl( 252, 100%, 50%); }
.element-item.halogen         { background: #F0F; background: hsl( 288, 100%, 50%); }
.element-item.noble-gas       { background: #F08; background: hsl( 324, 100%, 50%); }

    // external js: isotope.pkgd.js

// init Isotope
var $grid = $('.grid').isotope({
  itemSelector: '.element-item',
  layoutMode: 'fitRows'
});
// filter functions
var filterFns = {
  // show if number is greater than 50
  numberGreaterThan50: function() {
    var number = $(this).find('.number').text();
    return parseInt( number, 10 ) > 50;
  },
  // show if name ends with -ium
  ium: function() {
    var name = $(this).find('.name').text();
    return name.match( /ium$/ );
  }
};
// bind filter button click
$('.filters-button-group').on( 'click', 'button', function() {
  var filterValue = $( this ).attr('data-filter');
  // use filterFn if matches value
  filterValue = filterFns[ filterValue ] || filterValue;
  $grid.isotope({ filter: filterValue });
});
// change is-checked class on buttons
$('.button-group').each( function( i, buttonGroup ) {
  var $buttonGroup = $( buttonGroup );
  $buttonGroup.on( 'click', 'button', function() {
    $buttonGroup.find('.is-checked').removeClass('is-checked');
    $( this ).addClass('is-checked');
  });
});