The problem is that IMDBID changed its format and since it doesn't provide an API to its data the normal method (which is scraping IMDB for data) produces all this incorrect data.
I reported something similar here
but only so it's tracked. There's not much to do other than fixing the scrapers and repopulating the data (a good idea possible would be to pull all the IMDB data from a backup and stop updating all of it, leaving only the ID and name(s)).
This will need a revision on the scrapers, which I'm sure Oss is hard at work with. In the meantime a good chunk of functionality is broken (e.g. SolEol
can't upload subs as it uses the IMDB search functionality from OS to get its IMDB IDs).