I haven't seen this before, but the first thing I would check is the portal alias for your module. Have you noticed this problem with any other modules or just the blog module?

I'm not clear on the problem yet.  It looks from the first example as though this is on an intranet.  Is there a way for us to see an example?  We'll need to be able to duplicate this issue in order to come up with a solution and one thing that might help if this isn't visible to the public is to copy some of the output from the page into your post.  Let us know, too, if the problem is related to RSS or to links in the blog entry.  I'm not clear on that yet.

Thanks for your patience while we try to help,

Don