Crazy volume on the Rc300

Hi everyone!

My RC300 is playing back at different volumes to what I record at. It's very odd and instantaneous. I record live and when it comes back to loop it's louder or quieter.

Play back and record levels are set the same for every track (100).

No external gear is effecting the signal post the looper, it goes straight to the desk (or DAW dependent on the task)

Any ideas?