Im having issues with the Paypal section of my form.

People are not able to submit they're credit card info at check out. 

Im sorry unfortunately I don't have the exact error message?  Ive had several users report back to me saying its not letting them enter they're credit card info. I also noticed that I have several repeated submissions from users re-enterting in they're credit card info. Thanks 

Here is the site I use for the form.