I just noticed this today on my most recent blog post. I inserted several images whose source is from Flickr. The pictures show up fine. In the settings for each image, I had it redirect to that picture's Flickr page when clicked. Everything looks as it should be in the editor - both Visual and HTML. But, when it's published, all of a sudden, the blog post URL is appended to the front of the target URL. And it's only for images - the text links work fine.
The blog I need help with is hereisthechurch.wordpress.com.