My Openpilot Revolution Flight Controller sends my drone leaping up several meters as soon as I activate Altitude Holding. It then fluctuates up and down by the same distance of several meters (about 5m). The drone works perfectly fine without Altitude Holding. So it's definitely a barometer problem. I have attached a picture showing you where the flight controller was (red). Would this position have been problematic? Would that position on top of the chasis attract unwanted prop wash?
I have just moved the Flight Controller farther to the center of the chasis but still on top of it. I don't know what else to do. Tomorrow I'll re-test.