Here's a small clip of my Thule T2 bouncing around on the Curt hitch.
https://youtu.be/IENoMQXRf1U
This or any number of bumps like this likely caused this:
Untitled by tk_1971, on Flickr
I was able to bend it back by pulling up on the rack.
Untitled by tk_1971, on Flickr