Hi! There may be several reasons that may result in an opponent's position 4 going faster than your position 1. It may be an internet delay where on your side, you see that you still have time to execute your mystery in position 1, while your opponent and the server has already executed position 4's mystery first before you even activated the mystery of your position 1. The other reasoning is that there is a small window that allows a player to counter or use mystery before the opponent (especially when they have the upper hand in both position and initiative. However, when this small window is missed, you lose your advantage to counter or use a mystery before the opponent and the opponent is able to go before you when theoretically they should not.

Hope this helps!

~Jib