Identity safe

Just one of my logins is giving me trouble .The login is to costco.com and i can fill in the login and then it asks if i want norton to organize this login and i say yes. Then it will appear in the dropdown box and will auto fill when i go to the website . Then after a day or so i will go to the costco page and it will not autofill. Then i check the dropdown box/toolbar in IE and the login for costco is missing from that long list . If i open norton and go to manage identity protection and organize logins it is still in that list . I have deleted it from that list and then i am prompted to save it again and it works for a short time

 

any ideas ?

Thanks, jim