WordPress Title Problem

Hello everyone, I am facing a new problem lately in my site.

Everytime I share the post using the FB share button only my site nae comes up and not the post name along with the site.

For some posts before, when I clicked the FB share button, it used to be like ” Post Name | Site Name ” but now it’s only ” – Site Name “

And also on the tab only the site name shows up.

This is my site.

http://www.wordsofwacko.com

The initial posts (the first 2 poems, and first 2 articles) they were all fine.

But the posts lately are not so. If anyone can help me out with it, it would be great.

Thanks in advance, cheers!