Are you are seeing strange shortcodes when you view your Divi website on a mobile like in the picture below?
If so, you have Jetpack plugin installed and the Jetpack mobile menu theme activated, which is overriding the Divi theme mobile design. Divi is a responsive theme, meaning that it already includes the functionality to display on mobiles and tablets, without any further theme customization or plugins/
Turn Jetpack mobile theme off and you will see the normal mobile Divi site.

divi theme on mobile

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