Plane rolls off course on auto takeoff


Could you, please, help me understand the reason my plane (wing type) rolls sideways (usually to left) on catapult auto launches? It starts to roll left after motor starts up. According to MP, GPS track line jumps to side and plane starts to turn. Right after it reaches auto takeoff height (40 meters in my case) it turns back to the route. I’m attaching 3 logs of 3 flights. First flight ended in few seconds, because of crash while plane performed those turns. Other two flights were successful (second and third planes, all behaving same) with the only problem, as described, on takeoff. I have bin, kmz and tlog files if needed. Log files attached.

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