Sounds like your tranny throttle trim is dodgy, or something. I would set the throttle sub-trim to neutral, then the fine trim also to neutral.
Also then reset the GTB (hold the one-touch button while switching the GTB on, then wait for the solid red light, then hit full throttle on the transmitter, then green light, full brakes, then flashing green and return to neutral on the transmitter). It should then have the red, yellow and blue lights on I think, once it has finished setting up.
HTH
Mark
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