Oval holes

I have just printed a piece and the horizontal holes are massively oval i could not think what would cause this but
I think it is to do with the new z K8203 DIRECT DRIVE EXTRUDER threaded z rod can anyone advise

If long axis of hole is in the Z direction it would suggest you haven’t reflashed the firmware or the EEPROM. As I understand it the Pitch of the new screw is 1.5 vs 1.25 with the old.

Firmware on the vellemann site - Downloads