Can confirm. I don't have any screenshots (will take if requested), but I setup an AI3 in trainer with a deck full of golden nymphs, while I played a ghostmare with unupped ghosts. The AI threw away golden nymphs until a nightmared GotP was at the "top" of it's hand. It then loses 10 HP, but does not discard a ghost; a golden nymph has been discarded. At first I thought this was purely a graphical error, but after several turns of it discarding nymphs and losing 10 HP...
I believe that having the ghost in the first slot is what causes the issue, and that being the case, this should occur with other cards as well.
Will attempt this with other cards beside golden nymph and upped ghosts. Stay tuned folks!
EDIT: Upgraded GotP causes the same issue. This time, I only used nightmare once, thus the AI had only one GotP in hand. It discarded Golden Nymphs from the top of the hand until the GotP was at the top. Each discard thereafter caused -10 HP. considering there was only ever ONE ghost in hand, that pretty much proves to me that this is not a graphical error.