Usually with bent paper corners (Dog Ears !), there's something in the paper path obstructing the free movement iof the paper through it.
Try to pin it down to a specific tray if you can...
Try doing a Half-Cycle test....Tell it to print and then when its' pulled the sheet i about half-way, open the door to stop it. Are the dogears already there ??...that cuts your troubleshooting in half....
Good hunting....
( a blankclear plastic paper size sheet comes in handy - to run back/forth thru the paper path ).