indexed blog post issue

our site, http://www.fleamarketliquidator.com, had all blog posts indexed in google and then something happened- they disappeared? All blog posts should be viewed by non registered users, in other words free content.

all posts are set “below” 0, if that makes sense because I believe someone needs at least member level 0 to read content marked “0” ??

Am I correct? what could be going wrong with indexing?

https://wordpress.org/plugins/s2member/