(Not the best name to this bug reporting topic but i hope it should do it.)
So, i got few screenshots showing what i saw.
(Click on image to enlarge.)
And now the story what happened:
I got an opponent like usual and battle went on nicely. Up to the point when opponent realized that he'd loose when my next turn will begin.
I managed to hit him once before he quitted and my drone finished him/her off. But the message that i got wasn't the usual middle battle quitting message. (See the images above.)
He didn't quit on first round as first pop-up shows. (You could look the mech lifepoints that are visible at backround.)
I was able to click away the first pop-up but the round rewards pop-up displayed incorrect numbers (as seen from image). And i couldn't click on OK button to be returned to main menu. Go Premium button also didn't work. Only way to recover for me was to refresh the page, so the game would reload itself.
That may be a bug, but my guess is that it's some kind of cheat. If cheater plays and looses, he/she quits the battle before it officially ends and hacking/cheating program causes the game to malfunction, thus negating any reward the winner would have gotten.
Another strange thing here is that my opponent didn't have a name. (As seen from my screenshots.) How could that be a possibility? The game requires a log-in name and that name is also your name in the game and in the forums.