Popups somehow causing the mobile menu to hide behind the slider

Hi,

On the Cabinetry page of the website, there are images of doors, which when clicked, will open a popup with the corresponding door information.

The problem happens when the screen width is 1024px or less.

When browsing on Google Chrome, everything works fine. When clicking on the menu (which now becomes a dropdown menu), the dropdown menu shows on top of the revolution slider.

However, when browsing on Safari, the menu opens behind the slider. Also, the page title on the revolution slider appears and then disappears. This behaviour doesn’t happen with sliders on any other page.

I first thought it might have been a problem with the revolution slider, so I recreated the slider but the problem still existed.

I then tried recreating the entire page, which seemed to work, until I started updating the display rules of the popups so they will show on the new Cabinetry page.

I then tried deactivating the popup builder plugin. The page title came back, and the dropdown menu appeared on top of the slider. However, once I reactivated the plugin, the problem reappears.

Please advise!

Popup builder version: 3.69.3
WordPress version: 5.5.1

Thanks!

The page I need help with: [log in to see the link]