Issues with Some iOS/Apple devices

For about 6 months or so, I am noticing a consistent issue where the Contact7 form gives Error message when filling the form from some Apple/iOS devices (mostly iPhones).

Please check the contact form at:
https://www.watershedpm.com/wpm/contact-us-watershed-project-management/

I searched quickly and couldn’t conclude if this is a know issue.

Thanks for your feedback.