How did my rating go up?

I don't mind, because I'm under-rated right now, but it seems my Go rating jumped from 15.3 to 14.9 in the past week or so. I was gone from LG for a month and all my games expired in June. Except for two games where my opponent resigned before Move 1 (meaning they were unrated), nothing has finished since then.

Is there more to the LG rating system than a straight adjustment for each win/loss?

Did they resign or timeout? a timeout without a move does change the rating!

Ha, yeah, one was rated. Says right there in my messages. Delete thread please. :)