Most likely, you have a cookie on trademehub.co.nz , and the cookie being reset is
www.trademehub.co.nz . I suggest setting your cookie domain to .trademehub.co.nz (be sure to have the leading dot), this will make it always use the same cookie domain regardless of if you use the www when you login. After this, delete your cookies for the domain and re-login.
As for the titles, you exceeded vB Options|Message Posting and Editing Options|Time Limit on Editing of Thread Title between the original post and the edit. To edit the thread title, choose "Edit Thread" from the moderation dropdown.