In the form, when a dropdown (DDL) is open and I scroll down, the DDL automatically closes. This is a bad experience when the DDL has about 20 items that a scrollbar exists within the DDL so when the user scrolls down and scrolls far more than the end of the DDL scrollbar, the DDL automatically closes. This occurs when the form is long enough that it has a scroll bar in the page. SharePoint out of box has choice columns and its smart enough to prevent the DDL from closing in its form.