Performance in Scenarios - Hisako/Arbiter/Kan-Ra/Cinder

Well, i have an issue. My performance in some scenarios is VERY different than others. Precisely there are 4 stages where the game goes slow motion.

1- Hisako scenario
2- Arbiter scenario
3- Kan-Ra scenario
4- Cinder Scenario

The game goes slow motion ONLY in this 3 scenarios but runs PERFECT in all the others. Is this a bug? Its very strange :S