As I can see, this doesn’t work in Safari for your site also.
We do not have this problem on our test site. The issue can be caused by an additional plugin on your site.
Try to disable all the third-party plugins, that do not come bundled with our theme https://xstore.helpscoutdocs.com/article/36-included-plugins , clear all cache and check if you still have the problem. Once you find out which plugin causes the issue, contact the support of that plugin.
