Certainly odd...I would suggest you log a ticket with support...is this affecting only a single user or all your users? Do you have any duplicate courses?
So far it seems to be only a single user. It’s funny though, I used my admin permissions to see if I could replicate the issue on the users account but when I logged in of course, all of the duplicate courses had been completed and disappeared. I’m thinking maybe it was some weird tech glitch.
very possible...if it no longer shows to the user, probably consider it a glitch...support would want to be able to replicate it in order to be able to address it anyway.