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I sent a test submission to your form and it seems to be working successfully on my end. After submitting the form, I get redirected to the Paypal page where I can complete my payment.
Does the issue still occur in your end? Are you referring to a different checkout? Please note that there is no Cart on the form. The total will be displayed on the Total section of your form.
For more information on Paypal forms, you can also check out this guide: PayPal Forms
If you are referring to a different concern or if I missed anything, please let us know.