That's quite odd. The gear is purposefully a bit large, so that it creates an interference fit which prevents it from slipping. It uses the "U" component as a spring to hold it in place, basically. So that's normal. Otherwise the teeth pop out and skip.
I'm not sure why it's popping out of the bushing like that though. Perhaps just too much interference on yours? Is it screwed in all the way? Did it pop out? It may be easier to assemble that gear before assembling the entire tourbillon cage into the bowl.