Question/problem with Forms and Paypal

I created a simple form with two products. When I select one or both products and click the Paypal button, I see some payment methods. But I only need Paypal, and not the others. Can they be disabled?

Then when I enter my e-mail address, and on the next screen my password, the paypal windows sends me back to the first screen where I have to fill in my e-mail address again. It loops, kind off.
Did I do something wrong?

Could you check please what is going on?

Regards, Peter

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