Visual editor is giving me a lot of troubles

Hello,

The visual editor from WP Bakery is ginving me a lot of trouble. When opening as a backend editor of my one page template with impreza theme every opening it puts a lot of extra rows in the template.
When ready with editing the unused rows appear in the frontend with code: [/vc_row]
When opening the editor again there are again a lot of extra rows in the theme. I can delete them but the code: [/vc_row] still remains.

Can someone tell me what I do wrong here?
The theme and WP are in the latetst versions
Please let me knos
Thanks for your time