RSS feed not working correctly?

Well, something is a bit goofy here. The source code that is shown here: http://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Fmascarawars.com%2Ffeed%2F vs the source code in my browser when I look at the feed are completely different.

In my browser the code looks like a proper feed with:

<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
	>

<channel>
	<title>The Makeup Artists Blog | Mascara Wars</title>
	<atom:link href="http://mascarawars.com/feed/" rel="self" type="application/rss+xml" />
	<link>http://mascarawars.com</link>
	<description>The makeup artists' blog for tutorials, advice, products & inspiration.</description>
	<lastBuildDate>Tue, 24 Mar 2015 11:05:29 +0000</lastBuildDate>
	<language>en-US</language>
	<sy:updatePeriod>hourly</sy:updatePeriod>
	<sy:updateFrequency>1</sy:updateFrequency>
	<generator>http://wordpress.org/?v=4.1.1</generator>
	<item>
		<title>Bjork; Beauty Muse</title>

It’s like it’s giving different content based how it thinks it’s being accessed.