In addition to the pin thereory, you may also have had improper form. I would be willing to bet you dropped your arm instead of bending at the waist to make that shot and torqued the bow wrong. I would suggest practicing from an elevated stand at that distance with the pin thereory as suggested above and just drop your arm and aim that way then try bending at the waist and see what happens and let us know back. It will be interesting to know. Thanks. Don't ask me how I know about the arm thing at close distances!!!!!!!!