I’ve seen a few reports of the bug on the encounters, I’m attempting to investigate it but I’m having some trouble reproducing it on my device. Nofunnis found that if you put the battle speed to x2.0 in the settings, this bug does not occur, or is less likely to occur.
The color inversion on the icons is on purpose, as it is the hovering effect of the buttons, when they loose focus, for example moving the mouse away or pressing anywhere else, their color returns to normal. I noticed recently that this tends to persist on Android when it shouldn’t I’ll see if I make a slight change on the button feedback effect.