Hi there,
Thanks for updating. I can see this with Safari and it’s a bit weird. Do you have any custom code on your Customizer? You can take off all custom code if you have to check any conflict. You can also perform a plugin conflict for that.
If the issue still persist, you can try updating your theme.
You can find the latest version numbers here: (http://theme.co/changelog/) Then you can compare them to what’s installed on your site.
If you find anything to be out of date, you can review our update guide.
Hopefully that will solve the issue.
Cheers!