It was a controversial decision because images shown on television gave the impression that Wirtz was ahead of the last defender by a clear margin.
But the KMI Panel unanimously backed Madley, saying: “The VAR intervention to award the goal was supported as correct, given the tight margin of the offside call and thicker offside lines used for these incredibly tight calls.”
The game went on to finish 2-2 with Fulham boss Marco Silva describing Wirtz’s goal as “a clear offside” and calling for clarification.
Silva said the club had contacted Professional Game Match Officials to raise a complaint.
BBC Sport understands that the discrepancy lies in the choice of frame by the broadcaster.
The VAR selected the frame when Bradley first made contact with the ball, not when it left his foot.
The broadcaster froze the picture one frame later which gave the impression Wirtz was more obviously offside.