Hello Hamish,
I hope you are having a good day. I will be happy to assist you.
I have installed the X-Currency plugin (version 2.3.0) you referenced and tested its compatibility with our Product Price by Quantity plugin (version 4.0.4). I can confirm they are working together correctly on my test environment. I have recorded a video to demonstrate the functionality, which you can view here.
If the issue persists on your site, please ensure you are using the latest versions of both plugins:
Product Price by Quantity for WooCommerce: 4.0.4
X-Currency: 2.3.0
If you have confirmed the updates and the issue still occurs, please reach out to us via a support ticket at [email protected]. Include a recorded video of your setup and that clearly shows the problem. This will allow me to investigate the issue more effectively on your specific configuration.
Best regards,
Taha