Appeared in HA 2025.04 (I think). I don't know what triggers it, but it is rather annoying. Clearing browser cache does not help. CTRL+F5 "solves" it momentarily, but after a few minutes it's back.
It occurs even on totally new browsers that never accessed HA before.
See the screen recordings, they may show the issue better.
Anyone else seen this? Any suggestions how to solve?