ok so I know what causes it now
I may be stupid
when you die, it triggers a broadcast that causes a lot of things to stop / reset, one being the background, since it blacks out during attacks, and I wouldn't want it to start blacked out
for whatever reason, when the background resets on death, I had made it STOP REGULATING THE LAYER IT WAS ON, which allows other components to move behind it when specific actions are taken.
it... should be fixed in ~10 minutes