Error shown in credit card field upon form submission

Just when I thought it was all working there is now an issue with the payment widget. I am using Stripe and when the user clicks submit there is an error for the card expiry date saying it is a required field even when there is a valid entry in that field. Any suggestions?

Greetings and thank you for your message.

We are reviewing your form, and as soon as we have more information, we will get back to you.

Thank you for your patience. 

Thank you for your patience.

After further testing, we have noticed there is a condition that prevents this from submitting.

It's the last condition with a number of 31.

Please disable or remove this rule to fix your problem:

You have nothing to worry about, the payment field will be required if it's visible. If a user selects direct payment, then the credit card information won't be required.

Please let us know if this solved your problem. 

Great, that works. On a bit of a learning curve here! Thanks again for your help.