It’s hard to read cards on mobile.
If I tap a card to read the full text, the card then covers other cards. If I tap on another card, it now covers the rest. And if I tap the original card to remember a detail from the description, this now plays the card.
Edit: Looks like clicking anywhere else “deselects” the active cards - this way it is possible to read the description of all cards at any time without playing any.