We had an issue with one of the databases and some orders were moved to another subdomain (website, if you will). https://migration.buymoda.org/my-account/
I tried my damndest to get this fixed but the best way forward was to just let a few weeks of order history reside on this subdomain rather than try to patch a very complicated split in the database, the Matrix!
Many orders from December 1st were affected, as well as some orders through the 20th. They will reside there if you don't see them in your normal account area.
Sorry about that!