So as it turns out it's not an Aspire map if it doesn't break something in the game. In this case the storyboard might randomly break at the end.
Possible ways to fix it:
 - Delete, redownload, restart game, restart pc, etc
 - Try the alternative storyboard .osb file in the song folder (/alt). Replace the .osb file in the root folder with that one and make sure that you keep the name of the original .osb file, then try again