Many duplicates of ritardando

I was trying to delete the ritardando at the end here. At first, I thought it wasn't being deleted, but then I tried to drag it and realized it's a stack of a large number of ritardandos. I haven't been able to delete them all yet. I'm fairly sure I wasn't sitting there adding 10s, 100s of ritardandos to this measure. Is there a way I can get rid of them without sitting there for an indefinite amount of time deleting them one at a time?