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Sometimes you can get a wrong result when using the online metadata sources. You can 'help' Serviio by providing IMDB ID for the given movie (series not supported) in the file name or the parent folder.
IMDB ID has the form of 'tt' followed by 7 digits. You can find it in the address bar of the IMDB movie page.
In this case, you could store your movie as:
/some/path/Avengers tt0848228/file.mp4
/some/path/Avengers (tt0848228)/file.mp4
/some/path/Avengers [tt0848228]/file.mp4
/some/path/Avengers tt0848228.mp4
/some/path/Avengers (tt0848228).mp4
/some/path/Avengers [tt0848228].mp4