Hi,
I'm not sure, but it seems to me that currently, in the app, when you have multiple encounter cards they are revealed in the reverse order they were dealt (this happens too quickly, but I think it is done in that way). However, as per rules version 1.6:
"During step four of the villain phase, each player (in player order) reveals and resolves all facedown encounter cards that have been dealt to them, one card at a time in the order in which they were dealt."
Best,
Elías