You are not getting the fletching centered onto the arrow shaft. The primary contact point is the area that is gluing. You can move the vane clamp toward the side that is gluing a fraction and that should take care of it.
you need to adjust it ,before you glue any more ,sit a vane into the clamp loosen the adjustment screws and adjust as necessary so the vane sits fully on the arrow shaft move the top right and the bottom left to get an offset (or visa vera)
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