Heading Text Colors Keep Changing

I'm working on a site with a template that keeps changing the colors back to a blue color I've associated with the site.

I've changed the Wordpress heading colors to dark grey, changed all global colors off the blue and onto the dark grey, set all presets off the blue and onto the dark grey. I've also changed all the CSS --root colors to the grey.

Every time I edit a page and don't specify the heading text colors as the grey inside divi, they will go back to the blue on the live page.

Any help? Website is here: https://stream.oftaweless.com/services/cnc-milling/