Halo Reach on Xbox One; Lost Rank

I was Colonel Grade 3 last time I played Reach on the 360 and now on the One I’m Lt. Colonel Grade 3. What’s going on here?
Even HaloWaypoint is now saying I’ve never played Reach even though I checked my Stats a few weeks ago and everything was in order.
Can I expect this issue to be sorted out or have I just lost my rank?

Nevermind