Z-Offset is not saved VC4 - firstlayer

Hello,

i purchased a VC4-300 with the hybrid kit.
Everything looks alright but now i having problem with the first layer. I always have to change the z-offset down during the few first seconds. Its something around 0,1mm, then the first layer is okay. After save config nothing happens.

After homing and beacon probing a have the same distance. see screenshot