My form isn't working on mobile

Hi. I have had 2 customers that telling me they did a booking and didn't get a confirmation mail. I looked now and I haven't gotten anything either. The form works on computer but not iPhone . This is really scary.

Form name:

Booking and contact information

I have included it here on an iframe:

https://www.althurayaredsea.com/book-test

Hello There!

Thank you for your message.

I test your form and is loading correctly using Safari on iPhone, please allow us to submit a test so we can check the error message.