WPBakery Post Grid problem

Hi,

I have two problems and I would be thankful if you could help me to solve them.

1. I would like to build a custom post grid (using WPBakery Post Grid tool). Everything works almost fine when I am using any grid element template except that I am getting an unwanted margin on the right side of a page. Please check: https://przednami.pl/blog/

2. I would like to modify predefined post grid template (using WPBakery Grid Builder). But when I am creating a new template or customizing existing one (even if it is a minor change, like a change of button color) all posts displays not as a grid but one after another. Check: https://przednami.pl/blog-2/

I also have to mention that I already added this custom css to solve responsive layout problem:
@media all and (max-width: 768px){
.vc_grid-container-wrapper .vc_col-sm-4 {
width: 100% !important;
}
}

Thanks for your help!
Kamil