Hey Kjael,
I’ve looked at the code, and the reason the button disappears is because it has been inserted as a menu item, and has a “#nav-primary” element id. I wouldn’t recommend this since that id is usually reserved for the primary menu in WordPress, and duplicate element ids on the same page are not a good idea either. Could you please tell me how you inserted the button, was it a third-party plugin? Have you tried inserting the button via the theme’s shortcodes?
Sincerely,
Andrii / Satori Studio