Kind of a strange bug with Kalista

Hey guys I was playing against Kalista and in the death recap and since Kalista got the assist it listed how she dealt her damage and one of the ways was called "kalistacoopstrikeproc" not sure if it's supposed to say that but I would guess NOT. I am posting this picture about a week after it happened so it might have been fixed but just in case I thought I would show this in boards. Link is in the description if you want to check it out for yourself.

Thanks for reading!!!