Duplicate torrents are a problem and demonstrate either sloppiness or deliberate rule-breaking.
To be fair about uploading duplicate movies.
I don't upload that much since virtually all of the movies I get are from here. But I had uploaded a duplicate once - after having searched the site under the name of the movie, the name of each of the performers, and the name of the studio - there had been a previously uploaded file a few years before under a made up name with no information on the performers or the studio.
Same here, I got nailed for a duplicate. A torrent I wanted was dead, so I found it somewhere else and uploaded it here and it was reported as a duplicate. The correct way to handle that situation is to ask a moderator to run some tests to see if the torrent is truly dead. If it is, they mod will give you permission to upload it.
In your situation, where the original file was not properly labelled, a moderator might have been able to take down the first torrent if it didn't meet the rules. I don't think they would penalize you in that situation if you made a good faith effort to check for duplicates and found none because the original torrent was not documented correctly.