This problem was fixed in today's patch (you can find the details here).
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Opponents Discard pile stuck on screen
By Wezurii#9369 October 13, 2016, 18:26:09
AnkaTracker
Game Version: 0.8.1.5306
OS: Windows 10
Time/Date: 13Oct2016, around 12:00 EST
Desc: The opponnents discard pile got stuck on my screen, could not interact with the game (other than the option menu in the top right). The opponnents deck stayed on my screen after the match ended.
What should happen: The
Reproduction rate: I have not been able to reproduce this (granted I have not tried)
Interestingly enough this screenshot also shows the kama count not being shown on the deck select screen after a match is completed
OS: Windows 10
Time/Date: 13Oct2016, around 12:00 EST
Desc: The opponnents discard pile got stuck on my screen, could not interact with the game (other than the option menu in the top right). The opponnents deck stayed on my screen after the match ended.
What should happen: The
Reproduction rate: I have not been able to reproduce this (granted I have not tried)
Interestingly enough this screenshot also shows the kama count not being shown on the deck select screen after a match is completed

First Ankama intervention

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A similar thing happened to me where during battle I clicked the Discard Pile and the game would not let me out of it. Usually by tapping below the scroll bar of the Discard Pile it takes you out but i was locked in too; had top quit.
This problem was fixed in today's patch (you can find the details here).