When I start the automatic setup of the deck, up to the preparation of the "Master is coming"/"Master is here" stack everything is alright.

But: the main stack of cards is not dropped on the MiC/MiH stack afterwards (it hovers in the air), so the first card dealt is always from the MiH stack -> it's always the "Master is coming" card.

When you draw a card from the main stack now, gravity takes over and drops that stack on the rest of the cards.