What nop version do you use?
I checked the code and the plugin reads languageID from customer session.
1. What nop version do you use?
2. What database do you use (SQL Server or MySQL)?
Please check it again.
The plugin adds tracking code only one time on the order completed page.
If you reload the page the plugin doesn't add tracking code.
The old release uses only Language ID (integer value).
I did the new release and you can use Language ID, Language name, Language culture.
Try the new release.
Thank you for your idea.
Write to Moz.com and add IP addresses in the whitelist. I think that Moz.com uses hosting from another country.