GPS Loiter Mode - quad rises steadily

Hello everyone. I'm new to this forum and new to the APM 2.5. I need a little help please.

First off, here is what I'm flying:

Frame: QAV500

FC: APM 2.5 w/software v2.9.1

GPS: UBlox LEA 6

Motors: Turnigy 2217/16

Props: APC 10x4.6 SF

Lipos: Zippy 3S, 5000MaH

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