Mangled Formatting

I’ve got a problem with my most recent posts when they are picked up by Feedblitz for RSS syndication. When feedblitz picked up my last post it stripped all the formatting out of the post itself and delivered to my readers one massive block of text. All the line spacing, paragraph breaks and even some of the spacing between characters and words disappeared. I contacted Feedbliz who advised that the issue is with WP. The post look fine within my site but when I look at them here: https://www.feeds.high-output.com/ they are a mess. Any ideas how this can be fixed? Any WP experts out there can contact me @ [email protected]