I am using an EB 25k with a single button aux switch using a Y splitter cable. All of a sudden my EB will only calibrate to 1-82.
You should calibrate your expression pedal on the H9 or in H9 Control.
If you use H9 Control, go to Pedal Settings -> General Settings -> Pedal Calibration Disabled, and then set it to OFF once to calibrate the pedal. Full heel, then full toe … maybe a couple of times, to be certain. Once the correct expression pedal range is locked in, set it back to ON.