iPhones can't fill out billing address

Is anyone else experiencing this? I hosted a Zoom Event webinar, with tickets paid via a Paypal integration. For some reason, no iPhone users were able to complete their billing address form on their phones - the state dropdown menu wouldn't work, clicking on their state didn't fill out the field or do anything at all.

It's difficult to get tech support to help, because no one received an error message or anything like that. It worked for Apple tablets, Macs, and PCs/androids, but not iPhones. Additionally, on the iPhone it wouldn't work in Chrome OR Safari.

It's possible the problem lies with PayPal, but they had no answer for me either.