I'm having a weird pain in my traps after doing a press day. (Main movements: bench, incline bench, and OHP)

I have no trouble rotating my shoulder around, but if I do an 'air' military press then I can feel my traps tense up and I feel some pain underneath the muscle.

I'm curious what could have caused this and what a fix might be. Perhaps it's a bad idea for me to do barbell military presses or I should stop doing them to lockout?

I think I might move to doing higher reps with dumbbells/machines instead of the 5x5 scheme I've been following for barbells as of late. Maybe then transition to doing free weight bench for my warmup sets and use the smith for everything else past that. My 'shoulder' really isn't too happy right now.

Thanks for any insight.