Vortex Sound Research

I had my grandmother and my modular case going to a mixer which then output the audio to speakers. All the sudden today the speakers dont work the mixer wont receive the signal unless i use a trs cord on the grandmother, the headphones on the modular mixer and synth are fine but for no apparent reason they worked fine yesterday nothing changed but now i can only use headphones.

Can someone please diagnose where im being a dumbass