Depending on the light, my arrows look they are flying funny. Its the vanes rotating, the cock vane is white and under certain light conditions this makes it look like the arrow ins't flying straight. It is though.

I agree with above, after one day, with consistent groups, I wouldn't sweat it yet. If you really want to know, either paper test, or even better, shoot broadheads, if they are porpoising, you will know.

also, number the arrows, see if the same one(s) are doing the funny flying.

--Bob