Them. There isn't anything you could have done to cause that (except having email notifications enabled)
You must have (or had) subscriptions and other email notification forum settings enabled. Lithium has been messing with the boards a lot lately, archiving and moving older posts, and they must have re-surfaced a batch as new again, and you were sent notifications.
I see nothink. I hear nothink. Because I have all forum email notifications off except for emails for PMs.