Hi John and welcome. The left floor plate screw is not aligned with the long axis of the gun. The two screws may have been removed and not replaced correctly. The left screw will have a score line on the base. If the screw on the left does have the score, it has been over tightened.
Please ignore the comment about a + sign. I have long since learned that is on the middle screw when all screws are the same length. Need to revise this pic