Neptune 4 Max Incorrect Homing

This printer is using a modified Klipper version and the modifications are not made public (violating Klipper’s license)
We cannot (no information on the modifications) support this types and we also focus only on original Klipper.

You might also want to read a bit more about this position here: Importance of Open Source in 3D Printing and the Consequences of OSS License Infringement

Your best bet is to contact the manufacturer directly.