Steering Wheel Misaligned After Hitting Tree?

I have a 01 subaru outback and I was off-roading, and due to the nature of the trail I ended up clipping a tree. It did hardy any damage, essentially just scruffing the bumper a little--but as I swerved to the right to avoid the tree, the tree hit my tire. (Which was protruding because I had cut the wheel to the right sharply). After I got off the trail and onto the highway I noticed that while tracking straight the steering wheel was 10 or 15 degrees offset to the right. What could have caused this? I checked my tie rods, and they seem fine. There is no wobble or vibration even at speeds of up to 80 mph. What is going on here!? Any ideas!???