That's exactly what happened to mine and it was a beast to get the plate back where it needed to be. It didn't help that my tension bolt is seized.
I don't remember exactly what I did, but I think I ended up bending the plate out, so I could get it up on the lip and then squeezing it back together. Mostly used channel locks because that's what I had around, but man, it was brutal.
I can dig up my photos if needed, but yeah, my bet is that the metal plate needs to get back up on the lip.
Paul in AR