Thanks for posting in! This is not a bug. The issue is coming from the added shortcode in the Raw Content element: [appointment_form show_title="0" show_rating="0" show_price="0" show_excerpt="0" show_meta="0" show_sharing="0" availability_autoselect="0"]
You may need to contact the creators of this plugin because it is generating a broken HTML.
You are right; when I remove the short code, the sections display properly, but I copied this shortcode from the below link, and it is working there properly at that page. The only difference is that the code is inside Raw Element in one of them (broken one) and is in the depreciated Content Area in the other one. I will ask the developers of the other plug in.