Popup Pro doesn't pop up when Gravity Form includes phone number

Hi WPMUdev Team,

Over the weekend, I performed several plugin upgrades to a website (innovateschools.org) and I just discovered this afternoon that one of the popups (that presents a Gravity Form) stopped working altogether. After some troubleshooting, I found that the popup stops working when the gravity form includes a 'phone' field in it. When I delete the phone field, it starts to work again. Last week, before I performed the upgrade, this popup worked properly and without issue. How can I remedy this?

Thanks, Peter