Assuming that you have a right hand screw propeller it is just the result of the prop twisting the boat in the opposite direction from the way that it is spinning. The boat has a tendancy to turn to the left for the same reason. A boat will "walk" to the right from a stop if it is a right hand prop and at high speed the back of the boat trying to go to starboard makes the bow turn to port. Everything is ok.
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