Question about Outlook Express

Re https://snt002.mail.live.com/mail/contacts.mvc -- I edited 3 of my groups in the drop down arrow in left column, adding and deleting contacts from groups.  Also working with individual contacts, I deleted some names completely (I thought).  I double-checked my work by reviewing the group lists as well as the group attributions of each individual contact.  Taking precautions, I deleted history and restarted my browser.  Then I distributed messages to my groups.  After sending, I reviewed the distribution lists.  To my horror, addresses I had deleted were listed and had received a message I did not intend them to receive!  Rechecking the lists in "people" these don't show up!  What gives??? How can I be assured that changes I've made are really made?  And why is there a discrepancy between the "people-group" list, and the list attached to my sent message??  I'm angry and frustrated!