Embedded checkout on mobile

[Mario DC]

We've got an issue with the new embedded checkout widget not displaying all required information on older mobile devices (like iPhone 7, 6, 5). 

We are not able to select how many tickets we want. And then ,when you go through to the checkout it is also blank. 

Test page can be found here: https://design-culture.co.uk/test_mario/eventbrite.html The page displays everything only on newer devices like IPhone SE, 8 ,X etc.

Thanks for you help in advance.