Alpaca framework select with multiple:true inherits the selection status of its former siblings

This issue original raise on github of alpaca framework, https://github.com/gitana/alpaca/issues/731 Just open one here for getting support from stackoverflow community.

A Combination of multi select and array cause a problem that the second and later select boxes inherit the selection status of their former siblings.
See my codepen: https://codepen.io/hadakadenkyu/full/pooKyzy

any help would be appreciated!!