Abnormal Motor Behavior in Flight Modes Other than Manual

Hello All,

I am trying to build a VTOL plane and have stuck at some point. The problem is that, when I arm the plane in manual flight mode, the motors response to the throttle stick appropriately. When I switch to QSTABILAZE, QLOITER or other Q modes, the motors start twitching. I am attaching a log screenshot. The RPM plot shows the mentioned twitching like a noise in the graph.

Relevant Hardware:
Cube Orange+
T-Motor F35A BLHeli_32 ESCs (x2)
SunnySky V4014-9 400KV Motors (x2)

Software:
ArduPlane V4.5.4
ChibiOS: 6a85082c

ESCs are running in DShot150 mode.
Telemetry connection is established between the ESCs and the FC.

Your support would be greatly appreciated.

Thanks,

Edit: Log File [1980-01-06 01-59-42.bin - Google Drive](Google Drive Link)

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