I don’t understand why you were downvoted for asking this question. I’ve literally watched techs cause this damage by trying to open the lid with the back cover screws removed.
Most laptops have at least one screw on each side that goes through both the back cover and the hinge.
If the hinge is normally affixed with 3 screws and you open the lid with one missing, each mount is taking on that extra stress.
Best practice is to reinstall those screws before opening the lid with the back cover removed.