This looks like a elevator trim tab to me. And it looks to be on the up side of the elevator which would force the elevator DOWN. This would normally make the plane nose over.
To check what is going on with the elevator trim tab....When on the ground, go to CHASE plane view, pan to back of plane as your picture shows and run the elevator trim Up& Down to see what is going on with the trim tab... Don't know why it would turn to the Right....
Maybe you have individual profile for this plane??????That affects this plane and not the others..... Just my 2 cents...hehe Good Luck. Hope you find the problem..