Yes, this should be easy to fix by either:
- If the actual file is a movie or TV series, simply renaming the file (see below);
- If the actual file is a home movie then there will never be any matching online metadata - you either need to move these files to a separate shared folder and turn off metadata for that folder, or as Iveky has suggested, use .nfo files for all metadata (in which you can create your own metadata for your home movies). Unfortunately if you go the .nfo path at this stage it is universal - ie. you will need to create an .nfo for all video files (there are tools that help this process).
Assuming you want to stay with using online metadata sources - the way Serviio matches a movie/TV series to online metadata sources is by matching the file name of the video file. Have a read of my post here:
viewtopic.php?f=5&t=10626&p=70544#p70544. All you need to therefore do is rename the offending files.
To determine the file name of the offending files - in Mediabrowser (or perhaps on your TV - each is different) look under the Folders category and find the file(s) which displays the same cover art. Unlike the other categories, the Folders category will show you the actual file name rather than the incorrect movie name. You can then find this file name in that folder on your hard drive and rename it - as suggested in my linked post use Filebot to help you with the rename.
Hope this is clear - if not come back to us. Renaming your movie files is a pain, but its a once off process and well worth it in the end.