- What browser is this?
- Are you using any gadgets or other scripts that might affect this part of the content?
- Does this happen on long content pages? Can you link one if so? (Probably a lot easier to debug there.)
Hmmm, it is weird, I am not able to reproduce anymore. I was using Firefox ESR 60.0.8. The page was stable (I could scroll and see this effect) but when I reloaded the page, the bug dissapeared. So maybe it was a cache issue or something similar.
Can't reproduce the problem in Firefox, Chrome or Edge. User:Pamputt/common.js contains a lot of old junk.
gives "JQMIGRATE: jQuery.fn.bind() is deprecated".
gives "ReferenceError: hookEvent is not defined".
None of that seems to cause the problem, though, so it's probably a gadget, but you should probably remove that anyway. Once you've done that you should be able to just disable one gadget at a time and reload the page in between. That way you can figure out which one it is.