This happens when the "Don't send until yesterday's data is loaded" box is checked and one of the included businesses doesn't have data.
If this box is checked, the system will hold back your logbook email until data has loaded for every included business. The system will hold back the email for up to 12 hours then send anyway. So if you are receiving your logbook at 8pm instead of 8am, this is why.
Do not check this box if including business that don't have sales everyday, such as Banquets, Private Dining, or a Seasonal Patio.