The 'movie' was apparently extremely dumbed down and SHAFT didn't have enough time in their planned production schedule and could not finish the movie in time properly, resulting in unfinished, unpolished movie that would warrant either addition of scenes or secondary ending.
On the opening celebration, one person apparently said "In terms of entertainment, it is ordered like this: the Greetings by the Casts -> Hayate -> Negima. I'd say it's pretty understandable seeing how there was like a scene with five full minutes of white screen with only explosion sound effects.