Mop not working?

I love and use my robot vacuum all of the time in between deep cleans, I’ve never had any issues with it since I’ve owned it, until today. I pressed play to one of my presets as I always do and for the first 10-20 minutes or so it was working great! It’s half way through the cleaning now and the mop isn’t dispensing any cleaning liquid. The mop pads are moving around the floor as if it were supposed to be mopping but nothing is coming out! Any advice?

I do frequently clean the base and all other things on the dock and the robot itself to keep it in good condition. & I made sure the the chamber on the dock had plenty of cleaning liquid. Same goes for the fresh water.