For some reason the credit card number validation is throwing a false-positive. I've tested two different cards and they both return "Invalid credit card number." error. The fields all end up empty and I have to re-enter. Here's where the form is: https://wmcfest.com/sponsor-us/
It isn't leaving the server as far as I can tell because there's no sign of it in the Stripe logs. There are no php errors logged either. So it seems like a js/ajax validation error. Not sure where next to look for troubleshooting. We have the latest Gravity version, although Stripe plugin may be outdated if there's not an alert in WP.
Thanks for any insight.