I recently switched from the WB to the Carbon Apache. Since we are having some nice weather here in PA ive been shooting alot. The other day i went out to shoot and i was shooting like 2 inches to the left. So i made the proper adjustments and all was good. Then i noticed that every other couple days of shooting the same problem kept happening. I was shooting about 2 inches to left and had to move my sight. Anyone with any ideas what could cause this? Im shotiing the mathews chill and its a truglo sight. thanks