Follow the guidelines:
viewtopic.php?f=1&t=2595
and start at Note 1 which is "Correct Subtitles" for the particular entry. This will provide an option of Item 6 "Sub Filename CD1 (update)" This will upload as a new revision, V2. Or, if the episode just needs re-ID, replace Item 3 with the new IMDB number.
Do not try and upload like a normal procedure new submission, go through the "Correct subtitles" options per procedure. Try this again, if there are any problems, we can take this offline via PM and go through the specific details.
Sorry Scooby, I see that you just now addressed these updates.