Hello,
I think Iowegan is one the right track here. Resting the barrel on something will, in my experience, ALWAYS make the gun shoot high. go back to the range and shoot in the manner he stated with your arms on the bags, or even offhand and I bet you'll see a difference.
I've known alot of guys that have missed deer at less than 100 yards broadside & couldn't understand why, come to find out they had the rifle barrel resting on a crossbar of their stand, Trust me, you'll shoot high EVERY time compared to offhand or with a proper rest.
Good Luck!