I just purchased a new Bowtech Tomkat 71 pound draw wieght 28in draw length. I have had the bow for about 4 weeks now. The problem is I was shooting this weekend and was grouping good and all of sudden it started shooting 6in to the left. I checked my sights they are tight couldn't see where they had moved. I looked over the Limbs didn't see any cracks. One thing I did notice is that the bow string had twisted. When I pull it back it doesn't feel the same. I took it into the bow shop and he told me to adjust my sights. Any help would be greatly appericiated.