Unreleased title was added by accident in import and now I can't unmark it

So I just imported a csv file of movies I've seen and it mostly went okay a side from a few mistaken match ups. One that is still posing a problem is that Planes Trains and Automobiles (1987) got mixed up with this unreleased Planes Trains and Automobiles https://www.imdb.com/title/tt12915962/?ref_=wh_t_1. That one is now showing as watched on my profile (https://www.imdb.com/user/p.iepph7iapjmuxjr6fho265hcju?ref_=up_nv_profile) and I seemingly have no way of unmarking it since it's an unreleased film. Hope I'm posting in the right place and can get some sort of solution for this as it's rather frustrating! Thanks in advance...