Kicked from Draft

I started a single player draft run and the ai were all stuck in the corner of the pitch. I played the game out as normal and then as soon as it finished it closed the full game.

When I got back on I found that the win I had gotten did not count and that I had been given an auto 3 nil loss.

I'm not too bothered about this but was just curious if anyone knew the cause or fix? Never happened before and my connection was stable the whole time.