Please downgrade PHP version, and do not update it till the next theme update.
The mixed-up state on your site is independent of these changes. It looks like, you used a child theme but now activate the parent theme.
Parent theme does not inherit child theme options. So, once you switch from child to parent you get other settings. If you want to import child setting to parent you need to go to Theme Options > Import/Export > export child theme settings, then switch to parent theme and import settings.
