No bug.
There is no difference with the mechanism for uploading single files or one zip file. The zip file option is obviously there for practial reasons. The game match attempts to work out which game it is based on the time the game was played, the score and the exittime. Maybe what's happening is that the game does not match because of ticks (but I thought I took that into account). Maybe it's already there (but I thought that was handled as well). There is a very slim chance it is already there but I've managed to have it belonging to another player. This *may* have happened if you emailed me a 'public' game a long time ago and I put it there. Still, it should (at least now) be recognised as your game.
I have not finished the recorded game stuff. My intention is to (for most levels) have a hint game which is available for people who have not completed a level. Players who use this will be 'tagged' as having peeked at the game. On top of this I intend to allow people to make their games both 'public' meaning anyone who has completed the level can have a look and 'gallery' meaning anyone can see. Your level 23, 73, etc could be good gallery candidates. It's not like someone uncapable of completing the level without seeing these is going to be able to copy them!
I'm not sure exactly my intention, but if you have game IDs that you want me to "update" I am willing to do this (not necessarily immediately). In other words start a robot to go through all games that have been upladed and credit the extra ticks. I have offerred this before and would like to see DREAM's scores credited so he doesn;t have to player them over. I would like to see mine in the same boat but feel that is somewhat unfair unless you guys do it.
As for level 61, I may just extract those games for testing purposes. I don't think anyones done anything special/secret of this level yet anyway.