TwoTimingBlues

I was playing Halo 2 LASO around 3:00 AM on the Gravemind mission when the ODST title update came up and took me out of the game. After I downloaded it, I went back to continue my LASO run. I went to the playlist and went to Resume, but it said I was on Mission 1: The Heretic, instead of Mission 12: Gravemind. I called customer support and cleared my local saves to try and get the cloud save to fix my problem. That did not work, as it still says I must start from Mission 1: The Heretic. The strange part is that it still says I've completed 11/15 missions. I've put a video on my Showcase to back up what I'm saying as well. If anyone can help me out in any way possible, I would be very thankful.