Chosen Solution

How do I solder two layers back together when the top layer is slightly bent at the top? Thanks in advance!

If it is the front of the board that isn’t connecting I wouldn’t be too worried as they are all ground pads. If it is bent significantly you will need to solder the spacers back on and clamp it down while heating.  I think there are about 8 spacers. You might have to get them from an unseparated IC board if you haven’t saved any from the other boards.