BLtouch Z_offset

So I installed Biqu H2 V2s lite extruder/hotend on my VC 3.1. Updated X and Y offset under Bltouch section and it started showing error and asked to uncomment Z offset as well
Now everytime I update my z offset and save config it gets automatically commented out and printer shows the same error. Neither does that update the z offset. Please help
I'm attaching my printer.cfg file