Nasty altitde bug

I went mountain flying today and discovered a nasty bug.As soon as the APM goes over 1300m ASL it immediately thinks it's altitude is -1000m.This results in it immediately trying to ascend another 1000m.It is also reported in the mission planner as a -1000m.As soon as you descend below 1300m it returns to the correct reading.I was able to replicate it twice.Is this a hardware fault in my particular setup or is it a bug.The only way I could get my drone back was to put it in guided mode and tell it to descend to -800m. As soon as it physically dropped below 1300m ASL then the readings corrected and I could reissue an instruction for the correct altitude.

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