Site issues?
FYI- I have contacted a few sitters who have availability on the schedule and say they do overnights and 24 hour care but when i try to talk to them about booking they all say they are not available or have other full time jobs. This is a waste of both of our times and very unfortunate that your site does not list the days and times that the sitters are available for work. If they only do drop in's or walks they should be able to state that. You should be able to search for a sitter with filters like works weeks, works overnight, etc. and then find one that fits your needs and then try to book.
I tried to put this in feedback but then I received an internal error message so was unable to provide the feedback