We started a new site using DIVI because a DIVI layout pack fit what the customer was looking for. From the start we jumped into the Customizer in the child theme and the preview looked perfect; however, the front end never changed. We changed a background photo and this changed till we exited the page builder. We have never had this issue.
Out of frustration we started over from scratch and got the same issue from a different layout. We cleared out the DIVI cache by going to Divi > Theme Options > Builder > Advanced.
We found our fix by turning off the “Static CSS File Generation“.
Let us know if this helped you…