No it's not normal, but because these boats are so light and flat bottomed they are sensitive to weight distribution. Have a look around your boat and make sure your gear is spread out evenly. If you are riding with a few people in the boat get them to move from side to side and see how it affects the pull. I know when I have a few of my "larger" friends in my Utopia if they both sit on the same side it pulls hard one way.
This is a simple place to start, but may not be your whole problem.
Aaron