I assume this is IE11? Problem is that IE 11 has all kinds of weird issues (put a date field in the lower right corner on a form and try to select a day from the calendar....). IE is just not being further developed anymore. I know customers do not like to here this but they should move on to Edge, Chrome or Firefox.
But this post might be a nice collection of weird issues in IE11 and what can be done about them. For the Date field for instance we simply moved it to a different location on the form. Not ideal, but practical.