RE: Uh oh...Houston we have a problem
Rob has a point,check all the broadhead tipped arrows and see if they impact the same.
If they don't,throw out the fliers.
Then start the tuning process.
Walk back is getting the centershot set so you are not concerned with anything but where the arrows hit left and right and yes,I do mean use the 20 yard pin at 20 and 40.Make sure you check the arrows left and right impactfrom a true vertical plane.
You can hold an arrow loosely by the nock end and hold it at the top arrow and see if the arrows are in line with the hanging arrow.
Broadhead tuning will set centershot but I preferto use walk back and then group and then I will check broadheads.