Can you accidentally make a request to a sitter as a "back up"?

I was messaging new people in my area today to find new available sitters, which gets hectic - I had about five different requests out, and people would reply they couldn't meet me - and they don't decline, so the request stays in my pending box.

Once on the website, not the app - I was using both - I think I skipped the step to send the request with a new sitter, and clicked the "add a back up" that pops up when you are about to send a request. I then got a message from a sitter I worked with previously, but with whom I am not currently working - with an apparent request to book for next weekend. I DID NOT SEND THAT REQUEST. My old sitter is the only alt on my list, so if I clicked, "add a back up" is that how my old sitter got messaged? I apologized and told them to disregard, but it's already awkward because I had requested cancellation for that weekend from them already, and that made it worse. Is there a way to take people out of your list of sitters if you aren't currently booking with them?

Thanks.