Autofill issue
Safari autofill shows old address even though I have deleted it everywhere.
Question marked as
Need to be more specific on where you have deleted it. I assume you me deleted at Safari > Settings > AutoFill > Using Information from my Contacts. Have you also checked at Safari > Settings > AutoFill > Other Forms? This is information that is stored for each website and you can clear all or remove the site individually. They may also be stored in a Cookie or Website Data that is cleared at Safari > Settings > Privacy > Manage Website Data.
Another spot to look is > System Settings > your name on top > Payment & Shipping. The address can be edited there.