Hi JB,
Thanks for reaching out with your BoldGrid Post and Page Builder questions! It’s generally recommended to only run one page/post editor at a time.
I can definitely see how this could cause some issues with your global elements. You could likely address this with custom CSS but we would have to take a look at effected elements with Post and Page Builder activated to give you more specific recommendations.
If you would like to temporarily reactivate the plugin and let us know we’d be happy to take a look!