G-webmaster says I got duplicate tags

I Just discovered on Google Webmasters that my posts are creating duplicate meta and title tags.

Somehow there is a version of each post that has a blank spot at the end and only google finds it.
Here is the page with the empty spot
http://tinyurl.com/4l2ho79
and here is the normal post page that you find at my site.
http://tinyurl.com/4qemd5x

I have 2 more just like this– “duplicate meta tags”
and i have this one that shows “duplicate title tags”
one with the space
http://tinyurl.com/4lse3ht
and normal
http://tinyurl.com/4cnrkyd

thanks for any input