in case you haven't figured it out or found another reason when you get a request click the approve/deny it opens a page at he bottom you will see a area says following request to add..look at their name then to the right you will seea icon of people and an icon of people with an X on it that is your accept or deny button, if you accept click the people thwy are added if you want to deny click the red x on the faces and they aren't added