The issue you're having with multicurrency is not entirely clear to me. To provide you with the best possible solution for the issue, I kindly request you to add more information about the issue.
Specifically, any error messages, specific steps you've taken, and the desired outcome will be very helpful in pinpointing the issue accurately.
Feel free to share any relevant screenshots or examples that can help illustrate the issue. The more information you provide, the better equipped I will be to offer an appropriate solution.
To get a better understanding of your site and system, Please also share the WPML debug information of your site. You can check the guide below to understand the procedure of getting and sharing the debug info.