I just installed the Porto theme from pTheme and it comes with “wpbakery” and I am having an issue trying to edit pages. I have used PageBuilder before and it is similar, but with WPBakery, when I move over a section / column/ row and want to edit it, the tool popup shows below or to the side of the mouse or text block and when I try and move over to click the Edit / pencil icon the popup goes away so I am unable to edit most of the page. There are only some sections where the popup is positioned where I can click edit before it goes away. WP 5.1, new install.
The best way to get the support is Contact your purchased Theme Author. Contact Author and let them know because Item Author are best expert about their Item functionality.