At first I suspected it could be a bulging battery, but I am not sure since the battery is located on the left side of the phone, and the right side has the motherboard and other components. (See attached picture.)
If could be as simple as a screw on the back of the LCD panel sticking out, making it harder for the screen to permanently seat in the phone. I would bring it to a local repair shop if this is something you don’t want to investigate yourself. A technician would be able to tell you if it is something like I just described or if it is indeed the battery swelling. At my shop, a diagnosis like this is something I would never charge a customer. Depending on the shop, this is something they should be able to figure out for you for free. Good luck!
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