Wrong Date Showing on Booking Page

Wrong Date Showing on Booking Page

Hi, wondered if anyone has any advice. I have set up a meeting with a custom date range for an in-person event (13-16th September), but on the booking page, the 12th is showing up. I have de-selected the day on availability as well as set the correct date range. This is coming up as no slots, but I don't want it to be the first selection on the Booking page. Any ideas? Thanks!