chain mounting next chain ring, front derailleur not touching, chain line messed up?
What else could it be? bb needs a spacer?
awhile ago chain ring, cranks, and bb were replaced with lesser components than original (campy > truvative).
rear cassette and derailleur still campy.
Bike rode fine
but got in a crash, now rear derailleur arm may be bent. I am getting the problem in the title
maybe something else got mis-aligned? I don't see how the slightly bent arm could cause the chain to hop up (at the front top chainring location). It is fed directly from the cassette.