RSS Feed Not Updating because of Old 'Last Build Date"

A few months ago, I noticed that Aweber wasn’t sending emails when I published a new post. I contacted them, and they said it was because the ‘last build date’ in my RSS feed didn’t match the new post I had published, so there wasn’t anything to notify Aweber that a new post had been published.

I contacted Bluehost, my server, and they couldn’t find a problem. I then contacted the support for my custom theme, Foodie Pro, and she said it could be an issue with Genesis.

I contacted the Genesis framework support, and they said that Feed Validator was showing errors, mostly related to the Easy Recipe plugin. I’ve had the errors show up in the Validator for at least 9 months, so that doesn’t seem to be the problem. (On a side note, even though I have deleted it, I have remnants of the Easy Recipe plugin in most all of my posts, so to remove those manually would be extensive.) I went back to Bluehost, and they, again, could not find the issue.

The code that shows up when my feed is viewed in Chrome is:

<?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>Simply Playful Fare, LLC</title>
	<atom:link href="http://simplyplayfulfare.com/feed/" rel="self" type="application/rss+xml" />
	<link>http://simplyplayfulfare.com</link>
	<description>A Practical Approach to Eating Healthy</description>
	<lastBuildDate>Sun, 19 Jun 2016 17:45:42 +0000</lastBuildDate>
	<language>en-US</language>
	<sy:updatePeriod>hourly</sy:updatePeriod>
	<sy:updateFrequency>1</sy:updateFrequency>

	<item>
		<title>Honey-Mustard and Thyme Roasted Almonds</title>
		<link>http://simplyplayfulfare.com/honey-mustard-and-thyme-roasted-almonds/</link>
		<comments>http://simplyplayfulfare.com/honey-mustard-and-thyme-roasted-almonds/#respond</comments>
		<pubDate>Sun, 19 Jun 2016 17:45:18 +0000</pubDate>

It shows the last published post is June 19, 2016, but on my website, my last published post is July 12, 2016 (today). A link to my website is: http://simplyplayfulfare.com/

I have cleared my browser history and cache. I’ve also checked my feed in multiple browsers on two computers. I removed the leftovers of many old deleted plugins from my ftp in my server. I disabled all of my plugins and have activated the 2016 theme. My next step, I guess, is to manually re-load WordPress, but I’m not really comfortable doing that. Any help is much appreciated, because I have no idea where to go from here.