RSS Feed content not working properly

I have searched the web and tried several different things, but I can’t find a solution to my problem. In my rss feed (https://www.c3church.tv/category/cross-training/?feed=rss2), I wasn’t getting content on my rss feed. The posts would show up with the titles, but the content would be black. The only thing that would show was a bottom blurb that was coming from my wordpress SEO plugin. I tried a couple of different things (including switching theme, deactivating plugins, etc), but to no avail. I found someone who modified their feed-rss2.php, and that seemed to start working, but there was no formatting on my posts. Now, all the posts but my first post in my feed is black, and the first one has no line breaks and the links are stripped. I am at a loss. Please help!