We have tested the YouTube on Contango Pro and it is working fine as shown in attachment.
I have noticed some errors / warnings in the browser console at your domain. I will suggest the following tips to debug the isssue,
– Please try to re-insert YouTube URL – I will recommend to paste the YouTube link in the editor Text mode to avoid any markup error.
– Please deactivate the plugins and rest this post. If it appears normal than re-activate all plugins one by one.
URL Parsing of Videos, Audios etc in the editor content is handled by WordPress core (Not by themes) so it should work properly.