The third goal that was a penalty was offside? Clearly not the goal itself, so I presume you mean the build up, durinig which dickinson was standing near the byline, playing the stockport players near the edge of the box onside.
That just got me wondering why an attacking player can be "not active" because he doesn't touch the ball, but a defending player is always "active" even when he's nowhere near play. Odd. The offside rule really is an ass.