Session has expired

Hello,

We have encountered an issue, and we believe that it might be the Curcy plugin.
When adding a product to the cart and proceeding to the checkout, an error occurs, which shows the following message: “Sorry, your session has expired. Return to shop.”

This error only happens when adding a product with the native/original currency set, EUR. For the other currencies that we use, there are no issues. Good to add that by turning off Cursy, the error disappears.

How can we further troubleshoot this and fix it?
Appreciate the help!