Colour not changing

Try to clear your Divi Static CSS File Cache & see if it works: WP Admin > Divi > Theme Options > Builder > Advanced > Static CSS File Generation > Clear

If still not working, will check further on your site the next morning, as it’s already midnight here.

 

Have you tried to clear / disable Divi Static CSS File cache: WP Admin > Divi > Theme Options > Builder > Advanced > Static CSS File Generation > Clear / Disabled

If still not working, try to disable Dynamic CSS as well & see if it works: WP Admin > Divi > Theme Options > General > Performance > Dynamic CSS > Disabled

Let me know how it goes.

 

I see you're referring to the top section settings. It has a dark overlay CSS Class on it. To remove it, just go to the Section Settings > Advanced > CSS Class & remove free-background-overlay

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By the way, I saw that your submenu is missing on hover. It's because you set a border radius for the Row settings. To fix it, just go to the Row Settings > Advanced > Visibility > Horizontal & Vertical Overflow > Visible

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Also for your mobile menu overlap issue, you just have to go to Theme Customizer > Header & Navigation > Primary Menu Bar > Background Color & set it to be a solid color:

 

Try to go to WP Admin > Divi > Theme Options & click save. This should help to clear the cache as well.

If still not working, kindly check your PM.