Submit button to PayPal doesn't work.

Hello,
I am building a really large form. In this form I use logics, to determine from which part of the world you are, so the form can show the Membership Fee for your part of the world. To do this, I have created very large logics.
It seems that the button to submit to Paypal doesn't work. When I change the button to send the form via e-mail, there is no problem.

Website: https://thefellowship.co.uk/new/join-us
If you fill the form like in the image, you can test it.

I hope you can help me with this problem?
Regards, Peter

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