Corrupted CSS/Themes

After trying a couple of themes by the marketplace/custom.css the whole Logseq UI seems a little corrupted. I deleted all themes again, though it still shows messages with a wrong color and has a couple of other UI-glitches:

It looks like some css-content of themes I have tried accumulated and is still active.
I already tried a couple of things: deleted all installed themes, empty custom.css, restart, refresh, reindex, new graph - didn’t solve the problem.
Has somebody had the same problem or has an idea? Thanks!

Even after updates the problem persists and even on mobile it appears:

Really don’t know what to do. A full reinstall would be quite a bit of work :sweat_smile:

Just replying to avoid this topic becomes closed.