Possible ifixit battery swelling

Hi

I bought a battery replacement kit for a Samsung Note 20 Ultra from ifixit in december. I replaced it, all good.
Performance wasn't really much of an improvement over the old one and the phone felt like it was heating a bit more than before the battery swap and throttling in some games.

Now it looks a bit like the back panel is detaching a bit in the middle... which leads me to think the battery might be swelling.

Has anyone encountered such issues with batteries from ifixit? Did warranty process go well?