It just doesn't go in all the way, like one end is the farther one, the teeth are snug the closer it gets to the wall of the tower the more the gold teeth on that end stick out. Seriously about to straighten out that 90 degree corner piece were you would screw it into the tower
Actually i remember having that problem on a build.
It turned out the pci bracket wasn't exactly aligned.
Looked good i could even secure it (card wouldn't seat though)like everything was perfect.
Closer inspection revealed the bracket end wasn't in properly = card seated fine after corrected.