Select2 Multiple of Bootstrap does not close

I have this problem with the select2 of bootstrap (3.3.7) It is a multiple select that does not close. It is assumed that by clicking outside the select, the dropdown containing the list of options must be closed and it does not. I am using Explorer Explorer version 11, the strange thing is that in Firefox it works perfectly. Any idea what it can be?

Here I leave the select in html

$(".select2").select2();

<select name="selectUser[]" id="selectUser" class="form-control select2" multiple="multiple" data-placeholder="Select a User"  style="width: 100%;">
     <option>Delaware</option>
     <option>Tennessee</option>
     <option>Texas</option>
     <option>Washington</option>
</select>'