Formatting Issue when using Default Editor

I have a post where at the end I have a section for a “Contributor” as seen here: https://www.warnerfamilypractice.net/immune-boosting-iv-therapy/

When I do the same for a different post it doesn’t format the same. See here: https://www.dropbox.com/home/Screenshots?preview=screencapture-warnerfamilypractice-net-biote-hormone-therapy-right-for-you-1516309589525.png

In order for it to work, I had to switch the post from “Default Editor” to “Advanced Layout Editor”. Here’s the live page I am referring to: https://www.warnerfamilypractice.net/biote-hormone-therapy-right-for-you/

However, I need this post to be used with the Default Editor. Is there a reason it’s not formatting correctly?

Thanks!