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I did check your form and it seems the PayPal Donation field removes the decimal values only if it is ".00". If there is any value, it does display the decimal values correctly. Please check the screenshot below:
This seems to be logical as ".00" does not have any value and hence it is not being displayed in the PayPal donation field.
Do get back to us if you still want to display the decimal value and I will report it to our back end team.
We will wait for your response.