No images in the feed

Hello,
your plugin is really cool.
I have been trying to set it up nevertheless I can’t see images.
In the test page, the first part is regular FEED, then the second section “Advanced RSS with Plugin” I’m using your plugin but without success.
My feed is https://www.nicaraguayestravel.com/feed/
As a test I put CNN feed and it shows images, I checked on my my page and articles do have featured images. What could cause the problem?
Thanks a lot!

The page I need help with: [log in to see the link]