Different couplers front and rear

[cncproadwarrior]

I noticed that the rear Kadee coupler on my new Atlas GP50 was too high while the front one was ok. I replaced the No 5 on the rear with a No 37. After doing that it was ok. Is this a common occurrence?

 

[D&J RailRoad]

To high? I would be inclined to think maybe the chasis was bent.

 

[cncproadwarrior]

Chassis looks ok and it runs great.