I just used the Enhance lasso to pull one of the two remaining minions that were left in the tavern into my hand, however, it just generated a copy of one of the right minion in the tavern adding it to my hand and leaving the original minion in the tavern.
i experienced this issue too. It occurred when i played the lasso and immediately purchased the minion (that ended up being targeted by the lasso) before the animation completed. Result was two of that minion being received but only one being available in the tavern.