Case bulging after battery replacement Dec 2023

Hello!

I replaced the battery for Pixel 5 from iFixit

mid December last year (2023). Recently the screen starting separating from the rest of the phone and pulling the adhesive apart.

I looked inside by scraping the adhesive off and undoing the clips and there's nothing out of the place ordinary it seems. The only thing I can think of that seems to stop the case from fully closing is the battery itself even though I just replaced it last Dec.

Is there something else I'm missing why I can't close the case or why it might have suddenly started bulging? Do I need to replace the battery again even though it's only been 5 months?

Thanks for your time in advance,

Eric