Yesterday I was out on my practice range.
I normally shoot 40 50 yrds.On Wed. nights i go to an indoor range and shoot 20 yds.

Well yesterday I was hitting the bull at 40 and 50 so I moved in to roughly 30 yds and my arrows where hitting right of the bull by about 3 inches the elevation was spot on.

Then I moved into 20 yds and was again hitting the bull. So I moved back out to the other yardages and was spot on except for the 30yrd mark.
I am shooting a Pat at 70lb 28 draw
Gold tip 5575 XT's at 26" 100 grain tips 3 x 5" right helical vains.
I have the HHA Optimizer Lite single pin moveable sight.
Bodoodle pro lite rest.

Anybody have any ideas why I am shooting to the right at 30yrds but dead on at the other yardages??
Thanks in advance