Dropdown list misplaced

[medixcare]

Hi,

I wasn't able to find an issue that dealt with the problem I'm experiencing. When clicking the multiselect to open the dropdown list the list does open but not near the multiselect. instead I was mostly experiencing it to open with following style attributes:

    left: 56px;
    top: 46px;

Which shows the list at the top of the page. See attached image.

If I scroll the page down by more than 12 pixels the dropdown is placed appropriately (next to the multiselect) (second attachment)

I'm using Version 5.0.4 of this great library with angular 11

[freddidierRTE]

Similar problem as issue #584