Max,
I believe the side that was pushed all the way forward had jumped a stop, but when you open it up you see the problem. Gently lift the part that was pushed past the stop and return it to its original position. Also be careful of the internal cables as they can get caught and stop the movement of the pedals.
The cables are multi-strand and do not have any covering on the outside, so when the tension is removed from them they spread apart.
You shouldn't have any problems, it's an easy fix.
Tmaw