Can you remove the windshield bolts? 1 at a time only! It could be the last owner cross-threaded them and that was as far as he could force them back in. If you can get 1 bolt out check for mangled threads. Replace both bolts (again, remove only 1 at a time. Or you could have another problem trying to get the backing plate back in position). Same goes for the lower side of the plate.
My guess is that someone beat the living snot out of the Jeep, pounded it back, then beat it again. Look for any damage to the windshield frame, and also in the front end of the machine. I know they are rare out by you, but you might need to replace
more than just some cross-threaded bolts.