Problem with Curcy plugin – prices change in cart

Hello,

I have a problem with the WooCommerce Multi Currency plugin (Curcy).

On the product page, the prices are displayed correctly in the selected currency (for example, 153 zł for a product).
However, when I add the product to the cart, the price suddenly drops to a much lower amount (for example, 4.61 zł instead of 153 zł).

This happens in different currencies (PLN, CZK).
I have tested it in incognito mode and the problem still appears.

Could you please check what might be causing this issue?
I will attach screenshots for better understanding.

Thank you for your help!