Nozzle to low after auto bed level grrrrrr

Hello all ,

Ik have some troubles with my nozzle hight . I adjusted the z off set with M851 and stored it with M500 and active with M501when i check with M503 it's correct . When i look in the eeprom settings i see it too . By checking G1 F60 Z0 it is spot on . When i start to print after the bed level it goes to far down , i go crazy . It doesn't matter if i work with Cura 4.4 or S3D it is all the same.

My start script:
G21 ;
G28;
G29 ;
G92 E0 ;
G1 Z0 ;
G1 X100.0 E20 ;
G92 E0;
M117 Printing...;

What goes wrong ?? I dont have mutch hair but by the end of the week i'm bald.
I have BLtouch as probe.

I do not mean to be snarky, but why not just find the actual Z height and set it in firmware? Call me paranoid, but I don't trust the EEPROM settings to set my printers up.

DLC

---

Kits: Folgertech Kossel 2020 upgraded E3Dv6, Anet A8 upgraded E3Dv6, Tevo Tarantula enhanced parts and dual-head, TronXY X5SA Pro(E3DHemera).
Scratch: Large bed Cartesian, exchangeable heads, Linear slide Delta, Maker-Beam XL Micro Delta, 220x220CoreXY.