I have been shooting my xbow for 3 years and have shot 6 deer within 25 yards and had quick kills on all. Until last night. My bolt hit 12 inches to the left and 8 inches high! I have practiced with this bow and with the red dot sight I always group within 2 inches out to 30 yards. What could have caused this? I am also a pistol shooter and hold a steady aim. The bolts are carbon and straight. The mechanical broadheads always fly true. The bolt was back against the string. Has this happened to anyone else? Any suggestions? The bow is 3 years old and I take good care of it.