Has anyone seen appointments for next day?

I have booked an appointment for Feb 2022 and when I was looking at the calendar, I saw there were appointments available for tomorrow and the day after. Is this normal? I checked again after 15 minutes and they were gone.

Has anyone seen this? Were those appointments for the next day booked by anyone in the past successfully?

Had a question, I have been trying to book a visa appointment but after I pick the date and time and hit continue It takes me to this page.
Did this happen with you too?