This is common in dual-extrusion setups. The manual covers "Nozzle Offset." You must calibrate the left nozzle height to match the right nozzle perfectly. If one is higher, it won't stick to the bed.
: The machine comes pre-assembled; however, you must manually install the extrusion unit and attach the magnetic build plate. 3. Operational Procedures qidi x-pro manual
QIDI X-Pro manual, QIDI X-Pro troubleshooting, dual extruder setup, QIDI slicer settings, 3D printer calibration. This is common in dual-extrusion setups