iPhone prevent cross site tracking

Hello,

this is a difficult question: I use JotForm on my website. I have a hidden field that should not show up on the website – this is done with the help of an iframe that links to the JotForm. This works fine in all the browsers – the field is hidden there. However, it is visible on my iPhone when the setting “Prevent cross-site tracking” is enabled. The field disappears when this setting is disabled.

Would you have any ideas on how to get around this?

Thank you.