Touchpad bottom-left corner slight depressed

The bottom-left corner of my touchpad is depressed slightly lower than the bottom-right corner. It’s been like that since I opened my Librem 15, and I made sure that all of the screws were in tightly (I did open it, to change out the RAM, and to add an m.2 SSD). It still works, but the touchpad doesn’t sit like this on my Librem 13v2; on there, it’s pretty level.