I agree with what Whip said about correcting the twist. My experience is that fixes are temporary. In other words, you get it corrected and a few days or weeks later, it comes back. When it comes back, try to catch it before it gets too far out of hand, and it will be easier to correct than it was the first time.
A limb twists because one side is weaker than the other, either because of something inherent in the wood or some excessive stress placed on it. Why doesn't really matter, because the correction is the same: make the other side just as weak as the side that twisted, because unfortunately, there's no way to make the twisted side stronger. Since you've now got two weak sides, the chances are it will twist again. Which isn't the end of the world; just keep correcting it before it gets too bad.