Issue with editing homepage of Mitech IT Solutions Theme

I purchased the Mitech - Technology IT Solutions & Services WordPress Theme from your site. I customized the Trusted Services home page.
I was trying to customize the home page using the WPBakery page Builder. As the home page that i selected was having a vertical slider, I am only able to edit the first slider. I am unable to view the remaining sliders on the editor.
When i tried to open the page with the regular editor, i cannot even view a single character on the editor screen.
Please help.

Please get in touch with the author of the theme to get support:

Great theme!