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That’s seem have some issue with config of your server and it cause this issue.
If you can manage your .htaccess file you can try to fix it follow this tutorial:
(It’s working fine on Safari now: https://prnt.sc/txgynf)
If you can’t do it please go to Appearance -> Customize -> Additional CSS and add this code:
I’ve another problem, I think it’s related. In the mobile version I cannot see the “+” and “-” symbols in the menu (even in safari mobile). I have attached the capture. Can you help me with that? Thank you very much.