Don't forget that the same image shows the ball was already in the air so Casey would have been slightly further back from the goal. The VAR team decide where the point of contact was to draw the lines and got it wrong. I think the English system is computerised for points of contact whereas ours is just the VAR team going " But, Rangers."
The still picture with the lines drawn on appears to show that the ball is already in the air so the lines are not drawn at the point of contact. I think he would possibly still be offside but it would be a much tighter decision.
Definite pen, Oxborough stopped and waited for the ball which let the forward in. I wondered if he might have been offside as the ball was played in initially but not seen a replay.
Halliday's free kick, I wonder if our player who ran in front of the wall got too close to them, supposed to be 1 metre away from them, thus indirect free kick.
Have another look. The ball to Miller, who was offside, came from a Hibs player therefore he was onside. If only we had something like VAR where it could be checked.