I was looking at my Marriott reward activity for last year and just noticed something funny on my December stay.

I had a single day stay in Renaissance Times Square (NY) which was paid for by the corporate account. However, on my online activity, it shows "79L 2011 VISA FREE NIGHT CAT 1-4" and says "REWARD" rather than STAY. Did they use my reward certificate automatically? I am not sure what went on... but I do only have 326 points for that stay and it was atleast $350 for the room that evening.

Also, it shows that I was issued a 1-night cat 1-4 redemption cert on the same day in my unused certs.

Can someone please explain this to me? Thanks.