strange pitch angle measurement

Dear all,

In my flight test, I met one accident.

My hexa uses px4+apm flight controller.

during the accident, it flied in the loiter mode, and it flied backward, while I observed that the head was up and the tail was down, then I gave the RC command such that the hexa can fly forward. But the hexa still flied backward.

 when I check the log file, the pitch angle shows that the head is down during that time! 

Could anyone give me some information of such problem? How should I check to confirm the problem?

Best regards

Xiang

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