If this also happens in Chrome and Firefox I assume there is some problem on your side. If this would be a problem in LS we would have the whole forum full of this. It might be a bug of this specific version of LS. So before you start anything else, you should update to the latest version of LS and see if the problem still persists.
By the way, I just tested this on my 3.14.4+ 180810 installation under IE 11 and it just works fine. Here a screenshot from IE:
I think the problem is the WYSIWYG Editor. As you can see, under IE11 it does not load.
Under Chrome I notice some delay in loading it, since LS 3. When I open a page, it sometimes takes a little while until the fields appear, where the editor is set.
Try to switch off the WYSIWYG-Editor and have it only as Popup and see what happens.