Duplicate entries in Axe Cop feed.

I’m seeing a lot of duplicate entries on the Axe Cop feed. Checking the RSS (I’m subscribed to http://axecop.com/index.php/achome/Ax… ), I only see one entry for each comic, but I suppose it’s possible that the feed has previously varyied something (?) incorrectly and NewsBlur is dutifully reporting the new guids are new posts. Not critical, but annoying.

Indeed, looking at the feed, it looks like the feed is erroneously claiming that the isPermaLink, but it isn’t; although my RSS knowledge may be out of date.