Hello!
I’ve just tried to replicate your structure on my local installation and no issue was found. I think it’s related with your installation/settings.

From the page source code I see there is Gutenberg editor active. Did you build the page with it or with WP Bakery Page Builder?

Could you send me a photo of your page while editing in backend?

Thanks,
Andrea

So first of all, make sure to switch the Page Template to Page Fullwidth under the Page Attributes Tab on the right sidebar.

Then try this procedure:
– click on “Classic Mode” on the top left blue button
– paste this snippet before all the code you will see
[vc_row css=".vc_custom_1555515527481{background-color: #497ca3 !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}"][vc_column][vc_row_inner qt_container="true"][vc_column_inner][vc_video link="https://www.youtube.com/watch?v=jFPG2RW6Z8s" el_width="60" css_animation="fadeInUp"][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row]

– Now click on the top left blue button “Backend Mode”
– A new row should be appeared
– Delete your old row
– Save it and check if the issue persists.

Glad it worked!
If you need more support don’t hesitate to open another ticket.
I’m going to close this.

All the best