Membership Confusion

Inspired by the talk at last night’s Puget Sound SIGCHI meeting, I decided to renew my long-overdue membership.  But apparently the people who created their web site didn’t consider that someone could have let their membership lapse for more than a year, as I appear to be stuck in a time paradox (click to enlarge):

I’m not quite sure what will happen if I click on the renew button.  Pay for membership this year (2011) or retroactively for last year (2010)?  Maybe I should have just renewed in-person at the end of last night’s meeting.