The shipping price for integrated methods such as Speedy and Econt works as follows. Your store submits via API, customer address, your settings in the integration module in your admin panel (such as test/open before payment, SMS notification, Insurance option, Back receipt request, etc., depending on the service provider). Based on this data and your agreement, the provider calculates the price and returns it via the API.
CloudCart does not make any calculations or surcharges on the delivery price, only reproduces what is returned by the service provider's system.
Pay attention to the settings and options you have selected in the integration module that you use in the admin panel of your store and compare them with those on the page (cabinet) of the respective provider.