Vtol-pixhawk4-ardupilot4.3.1 yaw problem

hi,
i’m working on a dolphin VTOL with a pixhawk 4 . i’m facing a problem : on any mode , the dolphin has a yaw movement ( left to right and after right to left). i tried to change the PID xhithout any result .
The auto analyzer :
Log File C:\Users\Pascal\AppData\Local\Temp\tmp85DA.tmp.log

Size (kb) 991.64453125

No of lines 11406

Duration 0:00:04

Vehicletype ArduPlane

Firmware Version VDD_5V_PERIPH_nOC

Firmware Hash 7d0c6e4d

Hardware Type

Free Mem 0

Skipped Lines 209

Test: Autotune = NA -
Test: Brownout = GOOD -
Test: Compass = FAIL - FAIL: Large compass offset params (X:16.23, Y:326.43, Z:-470.48)
FAIL: Large compass offset in MAG data (X:16.00, Y:326.00, Z:-470.00)
mag_field interference within limits (19.44%)

Test: Dupe Log Data = GOOD -
Test: Empty = FAIL - Empty log? Throttle never above 20%
Test: Event/Failsafe = GOOD -
Test: GPS = FAIL - Min satellites: 4, Max HDop: 10.52
Test: IMU Mismatch = NA -
Test: Motor Balance = NA -
Test: NaNs = GOOD -
Test: OpticalFlow = FAIL - ‘FLOW_FXSCALER’ not found
Test: Parameters = GOOD -
Test: PM = NA -
Test: Pitch/Roll = NA -
Test: Thrust = NA -
Test: VCC = UNKNOWN - No CURR log data
can you help?
thanks.