No paypal payment buttons

-- HikaShop version -- : 5.1.1
-- Joomla version -- : 5.1.4
-- PHP version -- : 8.1.29

Hi
I´m not sure if this is a Hikashop question or a Paypal misconfiguration.
I have activated the Paypal Checkput payment. It appear in the payment methods and can be selected.
But when I reached the final step I see a screen that says Use one of the or the credit card form below for your payment of ###
But no payment buttons are available. Only a form to pay by credit card and to type again the billing info.
Why I can´t see the payment buttons as the 3 months payment or paypal payment? That options are checked as available but no button appear.

Thnak you very much and sorry for the inconveniences.