It happened to me quite a few times:
1. search for a sub (for instance Last Samurai) and I get nothing
2. I make my own sub and upload the romanian version
3. try to upload the eng one as well: I get the message: the sub is already available
I can understand the probability of 2 people uploading same time subs, but several times it's highly unlikely.
Please check the logs and see if this is just coincidence.
I've tried checking the movie afterwards and it is still showing that no subs available for it!!!
Can it be because the movie is a mkv (matrioska) ?