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Hi all

Not sure if this a problem or completely normal but ive never come across it.

I recently upgraded to the Spektrum DX-9 radio paired with a JR R921X receiver and have it installed on a quad frame with an APM 2.5. Now here's the issue: every time the copter passes my position on the field the elevator and rudder 'servos' reverse polarity (for example, when the copter is on my right it moves forward with forward stick, but once it passes where I am standing, it suddenly shudders and wants to go backwards unless I pull back on the stick to keep it moving from right to left). Is this a special feature of either the radio or APM im not aware of?