Inconsistent font spacing between specific letters

I'm using a font called Nunito. Specifically weights 600 and 700. This font is imported on my website using Google Fonts with this line of code

@import url('https://fonts.googleapis.com/css?family=Nunito:600,700');

Now, if I write letters ší on my website the spacing is weird as you can see here

The code on my website is nothing but simple HTML. It may be worth mentioning that I'm using VueJS.

<h3>Největší</h3>

However, writing the same word inside Google Fonts displays spacing correctly.

Frankly I have no idea why that is.

@import url('https://fonts.googleapis.com/css?family=Nunito:600,700');

<h3>Největší</h3>