Forms with cart option

Hello,
I have created this test page: https://thefellowship.co.uk/new/test
When you fill in all the fields and click on submit, the paypal screen will pop up, and when you choose PayPal, a white screen will pop up. And nothing seems to happen. Then, when you close the white screen, you will see the payment screen. How can I hide the first white screen?

Regards, Peter

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