Is OMGF (Pro) compatible with Divi?
Divi's big update introduced many changes; how it handles Google Fonts is one of them.
To make it work with OMGF you'll have to disable the improve Google Fonts loading setting under Divi > Plugin Options > Performance.
Sidenote: there have been reports that the limit Google Fonts support for Legacy Browsers option also needs to be disabled, so I've added it here for full disclosure. In most cases, however, this shouldn't make any difference.