Game ended when it shouldnt have?

This is a nice game, but part of the way through the game ended suddenly for no reason, and everyone appeared to have autoresigned. However, as you can see from the screenshots, people are still playing and someone is on the verge of winning (so nobody has won yet). Unfortunately this gave my account a 100% resign rate, which isnt that great 
Is this a bug? Or is this intended behaviour? If so, what causes this to happen? Screenshots have been posted to show what it looks like (note the game is considered ended, but as shown people are still playing)

Is this a bug? Or is this intended behaviour? If so, what causes this to happen? Screenshots have been posted to show what it looks like (note the game is considered ended, but as shown people are still playing)