Hey! Ah, those are such cute endings -- I'm glad you like them! I'm sorry though that you ran some problem :(
The only thing I can think of at moment is if you played each ending scene entirely out to when the game tells how many endings left you have? (Like: Ending 7 - 3/3) It's been awhile since I've looked at the code but having that should trigger the Endings page in the Extras.