IMPOSSIBLE Z- OFFSET,VC 3.1 /500

I made X gantry (carbon, toolhead (vzbot), beacon from pinda, awd (tmc5160) changes. i asked a friend for help for the cfg file. then every time i bedmesh the z-offset started to change and the mesh started to come out sometimes above and sometimes below the flatness. No matter what i do, after a reboot or bedmesh the z-offset doesn't stay the same, neither does the z-tilt. i have been dealing with this for days and still can't solve it. i have gone through all the screws couplers etc. everything hardware related 10 times from the beginning. if you can help, you would really save my life.
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