lots of fun so far - nice level set
Not too tricky and it's always fun to play with rockets.
Anyway I think the problem is with your 'prg' file If you delete that one (then do the levels over?) you should have no problem. (actually, you should copy it to somewhere else, incase deleting it stuffs something up!)
I think it might have happened because you also have a level called 'Rocketman Series' - or because you did at one stage. Or something to do with a funny naming thing.
Hope that helps. It is recording the correct info for me.
EDIT: I said 'Not too tricky and it's always fun to play with rockets.' - this applies to all the levels except the last one! You are indeed devious and evil!