Thank you for contacting Payment Plugins. I reviewed your site and your checkout page looks correct and Google Pay showed once in the payment method section.
No i could confirm that i have in the settings PLACE ORDER BUTTON in Checkout Placement button.
Actually to avoid to see 2 buttons, one in the Gateway and other in the Checkout i add a JS script that remove PLACE ORDER buttin if GOOGLE PAY is selected.
If i revome this script i saw two buttons, different from Paypal where the setting works correctly and i m able to see only PAY WITH PAYPAL instead PLACE ORDER.
The checkout block is very restrictive on what can be customized. WooCommerce does not allow the place order button to be swapped for the GPay button so the button is rendered in the payment method section.
If you use the Checkout Shortcode the GPay button can will render in place of the place order button.
Ok but for Paypal it does, and in the setting is allowed, or not?
That is because PayPal supports a redirect to the PayPal hosted payment page. Google Pay does not have the same redirect functionality available to it.