I downloaded Concrete V8.5.4 and have been rebuilding a site. Today, I find that the login at the lower right of my site is no longer there - so I can't login to edit the site. In searching for a way to do it from the Concrete.org site, when I got to my profile/projects page, I found that I have 6 versions of my site showing. The top one shows correctly the themes and addons that I have, but the middle 4 are empty, while the bottom one shows two themes I looked at, but didn't download. Can I delete the un needed versions without deleting or compromising the top one that seems to be the correct site?