Hello!
The issue you mention (about missing 0.00 price) may be caused by a Theme you use on your website, or some other settings. Could you, please, send me a PM with your WP-admin access details, so we can investigate this issue?
Hello!
Thank you for this valuable feedback! I will transfer this information to our developer, so we can figure out any possible solution of this issue.
Hello!
Could you, please, provide a link to the product at your client's store and this same Product on AliExpress, so we can check the issue you describe?