When exporting the print membership card process results to a CSV file the Revenue Amount field that is supposed to display the total amount of the membership transaction, plus any add-ons or donations received at the time of purchase, only displays the cost of the membership.
We are currently evaluating this issue and will update this article when we have more information.
Steps to Duplicate
Sell a new membership in daily sales include an ad-on and an additional donation
Go to membership > print membership cards > run the process for the membership you just sold
Download the output to CSV file
Find the Revenue amount field > see that the entire order total is not reflected here, just the amount of the membership