Tessitura Google Analytics Revenue Reporting Double

Is anyone else seeing Single Ticket and Performance product category data from Tessitura being reported as one source of revenue in Google Analytics?

I'm seeing a problem with Revenue in the Ecommerce Overview of Google Analytics as reporting almost double due to the way Tessitura is sending Single Ticket and Performance product category data. I've created filtered reports in Google Analytics to filter the data based on the Single Ticket product category which better matches the revenue we are seeing in Tessitura reports but there are still discrepancies. I'd like to find out why Tessitura is sending Single Ticket and Performance product category data as two separate revenue sources. I'd also like to find a way to get the revenue results for online sales in Tessitura reports to align better with what we are seeing in Google Analytics.

The Tessitura Web Products team has already sent us the TNEW documentation on Web Analytics and let us know that tracking does not have "Single Ticket" as a category.

FYI, We are using the self hosted TNEW template for our web sales and Google Tag Manager to implement all tracking code.

If anyone has had a similar issue or has any ideas I could try to fix this, please let me know ;)

Thank you!