I have a website recently upgraded to Prestashop 1.6.1.5. It uses PayPal for payment processing. Since the upgrade a few orders include a line item called "Voucher Tax". On one order it was $999 while on another comparable order it was $1. It doesn't happen on every order and I can not find a pattern to why. It only shows up in PayPal and from what I can tell is never charged to the customer. Here is a cart summary where this happened.
Cart Summary
Voucher taxes $999.00 USD Shipping $20.00 USD Hydraulic System Upgrade for 1996-2006 Jaguar XKR/XK8. $1,000.00 USD
Rebuild/Upgrade Service for '96-'06 Jaguar XKR/XK8 Hydraulic Pump $400.00 USD
Item Total: $2,419.00 USD Sales Tax: $0.00 USD Shipping: $0.00 USD Handling: $0.00 USD
Total amount: $1,420.00 USD Fee amount: -$31.54 USD Net amount: $1,388.46 USD
There is no item in the site named Voucher Tax.
Taxes are disabled.
There are no vouchers on the site.
Any ideas?