First of all, thanks for providing such a simple and nice theme.
I found the problem of the tags " <span class ="meta-nav"> << </span> " appearing on the screen next to the post pictures when you access those pictures and there are more than ONE picture per post.
The problem does not occur when there are a single picture in a post.
I have attached the step by step reproduction of the issue:
Hope that helps.
I've searched for similar problem in the forum, but no luck... if it was already responded, please send me the link.