How can I make my JotForm mobile friendly?

Hi, I have a JotForm on my contact page (https://www.autoruitcentrale.be/contact/) (sorry, the site is in Dutch) and when users on a mobile device (iphone) try to fill out the form, the field that they are trying to fill out disappears from their screen. It does seem to work on my Android device, but there are problems with iPhones and iPads. I'm losing quite a lot of contact requests by this ...

The website is a SquareSpace site and I used the JotForm SquareSpace integration code.

Many thanks in advance for any help!

I cannot seem to replicate this on my iPhone 6+ IOS10 device. Here's a screenshot:

Would you mind letting us know your current IOS version and iPhone model? We'll try testing the form on your website using the same device. 

The form is already embedded using our iframe method which is our recommended embed codes for Squarespace website. I suspect it's the OS version, but I need to confirm it first. 

Ok, thanks, I will check for the IOS version and iPhone model and report back here

We'll wait for your response.

Thank you!