I'm not on the jury, but I don't think critical bug fixing should be included in the time limit. It happened to me once when I was creating a mobile version that ran perfectly on desktop, but then showed a lot of errors during compilation and therefore didn't work.
Don't take it too seriously and don't let it spoil your fun at the Jam because you had to fix bugs. It's actually commendable that you want to showcase the best of your project, since it was finished, and you shouldn't be penalized for that.