Rover showing one spot available, but I already have a booking?

I usually only accept boarding for 1 dog per day (some exceptions) and have accepted a booking for June 8 to June 12. This booking has been confirmed by the owner and is all set. Because of other circumstances, I wanted to mark myself unavailable for all other services offered during those dates, so I went to my calendar, selected 6/8 to 6/12 and clicked "Mark as Unavailable". After I did this, I was worried this would somehow affect the booking I had already accepted (and wanted to keep) so I went back to my calendar, reselected the dates and increased the Boarding option to 1 dog. But Rover is still showing me has having 1 space available for these dates, when technically I'm already booked. I only want to take this 1 dog for these dates. I now know I should have just decreased the numbers for House Sitting, Walking, etc. instead of Marking as Unavailable, but how do I correct it? I don't want to receive additional requests for these dates, but I want the owner of the original booking to still be on the calendar.