Must be before End Date
Must be after Start Date
I had the sme issue with ODST. I no longer show any progress on this playlist yet I have the achievements? Please fix when you can.
Come back and post this a year from now when it is happening. Did you expect your 50 in 2-3 days?
Funny stuff there. Patience always wins out.
I am having the same issue as you OP. I'm hoping that it gets fixed by the time I get home from work today.