Read the difference between Magento 2 Base Currency and Magento 2 Current Currency and the method to convert price from current currency to base currency in Magento 2
The store set up with multi-currencies may require the solution to experiment with the features that require specific conditions for base currency!
Visit https://meetanshi.com/blog/convert-price-from-current-currency-to-base-currency-in-magento-2/ for the solution