Thanks for the welcome.
I moved one of my cookies that I usually save into my delete list and ran CCleaner, and CC deleted that particular cookie, even though it still remained in the delete list along with all the others when it finished. So I'm assuming that CC continues to delete the cookies even though they still all show up on the list. However, when I run CC and look at what's been deleted in the main window afterwards, I don't see a list of cookies that have been deleted along with cache, temporary files, etc. so I'm still not sure about what's going on. By the way, my wife also uses CCleaner on her computer, and she has the same situation.
But I'm thinking that CC probably continues to delete my unwanted cookies even though the list of cookies to delete still remains after a cleaning.