select2 working but display two select2 dropdown in add more code example

Example 1: select2 in modal not work

//replace it with your script
<script>
    $('#mySelect2').select2({
        dropdownParent: $('#myModal')
    });
</script>

Example 2: enforcefocus select2 modal

// Do this before you initialize any of your modals
$.fn.modal.Constructor.prototype.enforceFocus = function() {};