What other plugins are you using on the site? Is there one affecting the RSS feed, other than Yoast’s SEO?
The last image size you shared above (560×539) looks like the one which belongs to this plugin.
It looks to me like a plugin, or possibly your theme (it’s not one with which I am familiar), is going through and making changes to your content as it’s output to the feed, after Send Images to RSS would have done its work, and therefore overwriting it. My plugin filters the_content within a feed, but if a plugin is filtering the_content_feed, it may undo everything mine does.
This is more of a guess on my part, without knowing what all is working together to make your site happen, but when I compare the HTML output of your page with the HTML output of your feed, they are very different in terms of what divs are present, and markup. For example, your image is actually moved to a new div at the beginning of your content. The image and link code is still where it started, but the source has been changed to quoteImage' and the link tohttps://quoteImage`, so they’re showing as a missing image in the feed, although the image is being shared above in the new div. Also, the image data in the feed, which is different than what’s on the site, is different than what is set from my plugin–image width is one.
If you can tell me what plugins you have going, I hope we can sort out what’s going on. Thanks.
