This is more likely to be a Kodi (software) issue not an LE (packaging of software) issue; but some ideas in no particular order:
* Go backwards in time with nightlies and pinpoint the first date when the issue appears. We can then look at what packages changed on that date. I'll guess that the main package bump will be 'Kodi' .. but then we can look at what changed between the previous Kodi version (tracked through githash) and you can start a conversation with Kodi developers around that.
* Switch to the default skin. If the issues go away, it's either an issue with Arctic Fuse2 skin itself (something to take up with the skin developers) or the skin triggers a rendering problem (something for Kodi developers). If the issue remains; it wasn't the skin.
* You have a large number of add-ons installed. Switch to a clean environment (stop Kodi, rename /storage/.kodi to /storage/.kodi-old and restart) and then start to add back add-ons until you find the one(s) which trip the problem.