IE11 is long out of Beta now but the problem is still there.
Is it certain that this is a IE11 bug or is there any other solution for this?
We are experiencing this as well on Modx Revo 2.0.10.
I've been bug-spotting on IE11 for a while now. Got a little list going which I'll post soon on this forum for discussion before I actually submit issues to github.
It's worth noting that switching to IE10 mode, and in some cases IE9 mode, using developer tools (F12, bottom icon on the left, 'Document mode') solves most of the issues I'm considering reporting.