All mail Items gone...

I had mailed a few items to myself to save some space until I had more warehouses and to facilitate moving them to other Civs (forgot about the vault). Anyways, I believe the date the mail was going to expire was 5/26. Login just now and notice that they are all gone.

Nothing major on there that I can remember, just wanted to point out that there may be a bug with mail items disappearing.