I am also having the same problem for my blog Thetopblogger that whenever I search my post in Google with URL, it appears instantly on the top of SERP but when I try to find the same post with "Post Title" it is not showing anywhere!
I am using the previous Wordpress version, so later I found today that in Settings> Privacy the option "Ask search engine not to index this site" is selected!! I do not have any idea how it has changed without my consent but now I have made it index again.
Now waiting to see whether my post appear for exact title match in the next couple of days.
Oh, I am using Easy WP SEO and SeoPressor both and in SEO Pressor it has the field to include Meta so I am also concern on this whether this is conflicting with my Thesis theme Meta Title or not.