Trouble displaying basic channel display

I have playlists working on a page, and the channel working in a widget, but I can’t get the channel to display on a page.

Reference page: http://www.gardenfundamentals.com/gardening-videos/?preview_id=246&preview_nonce=3b2939e660&preview=true

https://ww.wp.xz.cn/plugins/youtube-channel-gallery/