Mobile menu not working

I am struggling with the mobile menu on my Highend WordPress site (kirkby.au). The menu works normally on my desktop and iPhone, but not when using an iPad. When using the iPad, the menu doesn’t open when the three-line mobile menu is pressed; rather, the icon changes colour, acknowledging it has been pushed, but the drop-down menu does not appear. I updated all of my plug-ins and cleared the cache on the site and my browser to troubleshoot, but neither fixed the issue. I am currently on WordPress version: 6.4.2.