CR6SE, far left of the bed the Z-axis “zero” is raised far off the bed.

Been printing well, had a couple of glitches with the Z-axis periodically raising up on the left side of the bed when auto-leveling or moving the axis across using the screen. Resets to zero position OK, but when moving over to the left just seems to want to be high off the bed.

How can I resolve this as I need the printer running ASAP for production.