Hi there thank you for reaching out, firstly thank you so much for downloading and using our plugin, and for taking the time to submit your request, we really appreciate it! The main purpose of the plugin is to work with the Admin edit order screen and provide the additional functionality to that screen but we do also try and support plugin conflicts as we find them.
So because our plugin is built to work with the base functionality that WooCommerce uses, orders should be updating correctly, my first question would be to to check with you if the order prices are updated in WooCommerce when our plugin is deactivated do the prices adjust correctly on the vendor screen or still not?
Could you also post some screenshots of the various pages in this support thread which will also help us get a better idea of the issue you are facing. You can use a service such as https://imgbb.com/ to get the screenshot links.
Lastly, we are unable to look at that page without login details and they also must never be posted here, so if we do need any access, we will reach out to you via your website contact page directly but if you can first please help us with the information above.
Thank you again and we look forward to your feedback so we can see how best to assist you!