Gold tip devistator

I have the gold tip devistators. I don't know the straightness on these arrows, but I have one arrow that keeps shooting the the right. I shoot from 40yrds all other arrows have a tight group to them but that one just keeps going where it wants. I some time get a tight group form it but it seams like it has a mind of it own. Can any one help me figure this rouge arrow out?

 

I had an arrow that was doing that a couple of years back. Could get no consitancy, I threw it out!

 

Make sure it is the same arrow every time then take that arrow out of the quiver

 

Its the same one it wasn't always that way just started flying funny. I am switching it out for a different arrow. Thanks for the help.

 

This is why I number all of my arrows. Every now and then you get a flyer