#50241320 turn 13.
It probably has something to do with throne room and playing an action card as way of the seal and one time as itself?
I recall thinking I could play a throneroom on leprechaun to gain 2 wishes, but unexpectedly the interface showed I only had 5 cards in play yet, so I played another card to bring the total to 6, to then play the leprechaun as 7th, only to get hexed. But in the "replay" (load old game) the interface shows the leprechaun as 8th card in play. This was not the case during the game however, and my opponent saw it as 7th card in play too. We were both confused. So this is more likely an interface issue not displaying all the cards in play correctly, rather than a bug with the workings of the cards.