It certainly looks like you now have another free night e-cert. Are you by chance signed up for the latest Megabonus promo? And if so, what version were you offered? If you received the "every 2 stays get a free night cert" maybe that is where the 2nd e-cert came from.

If not the Megabonus, maybe you have another promo that you are a part of that gets you a free night cert. I think there other promos out there like the http://www.flyertalk.com/forum/marri...ee-nights.html.

I might suggest giving MR a call and see if they can give you some clues where the 2nd one came from.