Dead on at 30, right at 40

[Wudstix]

What is this sight thingy you refer to? Anything past 13.7 yards is too far anyway!!!

[marshhunter]

this is incorrect

walk forward tune. you need to walk forward until you can hit the target. then stop. you are as far as you need to shoot.

This is excellent advise.

[jshouse]

This is excellent advise.

It still doesn't answer what's wrong with his setup though.

I am not an expert by any means, not even close, but could it be something with the arrows and not just the bow?

[HDWRENCH]

Just before CO for my Elk hunt I had a new sight put on and had to get the tuning done I was fine until 40 then it was moving at 60 WOW make the change and it was a bunch . I thought that back at 20 it would be wrong nope dead on . The further the shot the more the minor adjustments get to working against you

[Bigdaddy]

Sounds like your second axis is off. In addition you third axis will really be off.

[MagicBlade]

Take it to a bow shop and have them fix it.