Homing issue : Z raising all the way up before homing

Hello reprapers !

I have a quick question before turning crazy.

Did you ever experience your printer to raise Z axis all the way up on the Xhoming process ?
Here is my config :
- ramps
- XY : TMC2130 with sensorless homing
- Z : A4988
- Marlin 1.1.9

I have removed my Zprobe and changed it for an endstop (Undefined Zprobe in firmware as well)
When i start a G28 X : the Z axis will raise approximately 100mm before eventually homing.

This is really strange behavior.

Thank you community for letting me know whether i alone or not with this issue

Cheers

Thomas

For info :

I have tried to change my TmC2130 driver with A4988.

It still does the same phenomenon but less.
This time will rise Z by 40-50mm before homing X

Would this come from the ramps from the firmware

Cheers guys !

ok guys,

It seems that I managed the problem : it was an issue of pullup configuration with a plugged probe that wasn't working.
By activating the pullup and unplugging the Zprobe I managed to erase the error.

Cheers