Sounds like you're describing engine 'right thrust'. This is normal. Most models have the engine mounted so that it is pointing 1.5 to 3 degrees to the right of perfectly straight ahead. This right thrust will help to counter-act the torque of the engine causing the plane to turn to the left as the throttle is increased.

I hope you are not planning to fly this plane as your first R/C model. This looks to be designed for experienced pilots. I wouldn't want your new plane to be destroyed on the first flight...[]