Could have been your shooting technique or the wind; looks like they are stringing to the right (was the wind blowing from the left that day?). It is not unusual that when looking for the node, the horizontal variability can go hand-in-hand with the vertical; but since your vertical is flat I would guess it's not the load. To get a more reliable answer it would be better to shoot one round each for each load, then the second round per load, etc; in this manner changes in the conditions are spread across all the loads.
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