I think I have all of the settings correctly, but still received a booking from VRBO that is a back to back on the same day? One of my listings is remote and I need 24 hours between bookings. Is it that some are listed as "blocked" dates? Although the one I just received was for the same day as a booking, not a blocked date.
If you're API integrated this shouldn't happen. It might be something misconfigured. If you write in to us at firstname.lastname@example.org we can take a look at your account and help you nail down the specifics.
I haven't API'd yet, too busy, but I have the proper settings on VRBO and here, anyway, I'll double check as I just blocked everything on the one property so it won't happen. Once I've had a chance to API, I'll circle back.