[Solved, I'm dumb] Can't move mouse after map change

[DeAngelo]

I'm having a really odd issue I've never had before. I launch into my CS from the beginning, play through the intro level, it loads an opening credits level, and after that plays out it loads the next level. In this level I suddenly can't turn using the mouse. I can still move around with WSAD and if I position myself in front of an object I can still use left/right click to interact/throw. Everything is fine if I reload the map with the F1 menu, and it works fine if I change my custom story settings to skip the previous two levels and launch right into this one.