Most gaps in Demeter come from a connection or timing, not from Demeter itself. Work through these in order.

Check, in order

1. Is it after 8am? Yesterday's data lands overnight. Earlier than that, it may not be ready.
2. Is the right outlet selected? Check the outlet switcher in the sidebar.
3. Is the connection working? Go to Settings > Integrations, open the connection and click Test connection. See Check or update a connection.
4. When did it last pull data? The Integrations list shows each connection's last update.
5. Is the source right? Compare the number with your POS or other system for the same date.
6. Is it stock or food cost? Those come from Demeter Inventory. See Fix a stock number that looks wrong.

Still stuck?

Contact the Demeter team with the outlet, the date, the number you expected and the number you saw. A screenshot helps.