Throttle creeps up after arming

Hello,

I'm using a Pixhawk in a custom modified QuadH2O drone with DJI ESCs and Motors. I've noticed that upon arming, the motors spin as desired, but they begin to creep up in speed. This is fine if I want to take off and raise the throttle, but should I want to leave it armed and spinning for say 20 seconds, it will just creep up and try to take off. Is this normal behaviour or are there some parameters I can change in Mission Planner to stop this from happening?

On a side note, this setup is flying well, but I just want to iron out this issue.

Kind regards

James

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