I received your RSS.XML file and opened it up. As I suspected there is only one entry in the feed per post. The feed is showing the latest 5 posts, as it is designed to do. Have a look at the screenshot at the bottom of this post. I’ve tagged each individual post with a number at the beginning of that post’s
<item> tag in the feed.
Alloy is generating only one entry per post. I suspect the problem comes with how you’re trying to use the feed. The feed provides the most recent posts. RSS readers remember what posts have been imported and only bring in new posts. Whatever system you’re using for having your blog posts show on a different site is re-importing the entire feed instead of just reading the new post(s), I suspect. I can’t know since that isn’t my product though.
But, as I said, to set your mind at ease, click on and look at the screenshot below and you’ll see that there are not duplicate posts in your feed file.