Did it appear as a wrong match on your server before?
I think it can be connected to a previous mismatch.
Which usually happens when truncated files are matched. (Like a file download that was just started, or a video file that is still being decompressed.)
The result is that there is a bogohash in the database which fits many truncated video files.
The only cure known to me is a full Plex dance with the original mismatched file as well as all subsequently mismatched files.
Of course it could be also an issue in Plex’s metadata storage.
I will forward this to the team to verify.
