DUET2 IR leveling problem

After I use the IR sensor to automatically level, the nozzle always does not move on the surface of the hot bed when printing documents, and the nozzle is always about 1 mm away from the surface of the bed. Please help me see

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; Configuration file for Duet WiFi (firmware version 2.03)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.1.4 on Fri Sep 04 2020 09:43:22 GMT+0800 (中国标准时间)

; General preferences
M80
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"VORON 2.4" ; set printer name
M669 K1 ; select CoreXY mode

; Network
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S1 ; enable FTP
M586 P2 S1 ; enable Telnet

; Drives
M569 P0 S0 ; physical drive 0 goes backwards
M569 P1 S0 ; physical drive 1 goes backwards
M569 P5 S1 R1 ; physical drive 2 goes forwards
M569 P6 S0 R1 ; physical drive 2 goes forwards
M569 P7 S0 R1 ; physical drive 2 goes forwards
M569 P8 S1 R1 ; physical drive 2 goes forwards
M569 P3 S0 ; physical drive 3 goes backwards
M584 X0 Y1 Z5:6:7:8 E3 ; set drive mapping
M671 X-65:-65:515:515 Y-10:525:525:-10 S20 ; Z leadscrews positions S是最大调整
M350 X16 Y16 Z16 E16 I0 ; configure microstepping without interpolation
M92 X80.00 Y80.00 Z400.00 E420.00 ; set steps per mm
M566 X600.00 Y600.00 Z12.00 E120.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z300.00 E1200.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z30.00 E500.00 ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z-10 S1 ; set axis minima
M208 X240 Y240 Z240 S0 ; set axis maxima

; Endstops
M574 X2 Y2 S0 ; set active low and disabled endstops
M574 Z1 S2 ; set active low and disabled endstops

; Z-Probe
M558 P1 Z0 H8 F120 T6000 ; Set Z probe type mini ir sensorspeed and travel speed
G31 P500 X20 Y30 Z0.567 ;
M557 X50:235 Y50:235 S40 ; define mesh grid

; Heaters
M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
M305 P0 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M305 P1 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 1
M143 H1 S280 ; set temperature limit for heater 1 to 280C

; Fans
M106 P0 S0 I0 F500 H-1 ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T80 ; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P2 S1 I0 F500 H1 T45 ; set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 F0 ; define tool 0
G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures
M376 H10
M42 P7 I1 S0.5 F500
M280 P7 S50
; Custom settings are not defined

; Miscellaneous
M575 P1 S1 B57600 ; enable support for PanelDue
M207 S5 R0.0 F3600 T3600 Z0.00
M572 D0 S0.03
M912 P0 S-8
M501 ; load saved parameters from non-volatile memory
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss

See my reply to your other post.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].