I would like to report the same issue. Below is the screenshot of weird graphic glitch after it occurs: cards overlaying.
In my case, each Sinspawn encountered this way has incremental difficulty to beat, +1 for each consecutive enemy. 9, 10, 11 etc.
Screenshot: https://postimg.org/image/hq3089a4j/
Android 5.1.1
Samsung Galaxy Note 10.1 2014 Edition (SM-P605); fully updated
PFID-E0B3B5E00185BB8E
Pass & play: off
Permadeth: off
Characters: Valeros
Turn order: N/A
Location: Shrine to Lamashtu (bug occurs at every location)
Scenario: Trouble in Sandpoint, normal difficulty
Card encountered: Erylium / Wrathful Sinspawn
Bug occurs on first explore and subsequent explore