Strange Google search results

Hello,

I’m facing a strange problem with Google. Quite often Google doesn’t show my post title as search result, but only a link to my main site.

Check the attached files for example.

Problem: https://img17.imageshack.us/img17/2435/badfx.jpg

As it should: https://img138.imageshack.us/img138/2985/goodu.jpg

How to solve this issue? This is really bad for my SEO

Thanx in advance.