On my rover, the speed controllers calibrate well one by one, but together they seem to throw each other off. The throttle ranges get screwed up when both ESC's are on; if I leave the left ESC on and turn the right off, the right side actually continues to provide power (reverse). I've never encountered this before, and I think it's the APM. Not sure what to do, I feel like I've tried everything (re-uploading the firmware, calibrating hardware, etc.). Any help is much appreciated. 

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