My Nokia 7.2 Won't Charge Past 80% After I Replaced the Battery Myself

I recently bought a replacement battery for my Nokia 7.2 and decided to install it myself since the original battery was swelling. After carefully taking apart the phone and swapping in the new battery, everything seemed fine at first, but now it won't charge beyond 80%. I've tried different chargers and cables, restarted the phone, and even calibrated the battery by draining it fully and charging again, but no luck. I'm worried I might have damaged something inside or maybe the replacement battery isn't fully compatible, but the seller claimed it was an OEM part. Has anyone experienced a similar issue after a DIY battery swap? Could it be a software calibration problem or something hardware-related? What steps can I take to troubleshoot this without having to open the phone all over again?