After checkout - another product is added to the invoice????

Strangest bug ever: It started yesterday with no reason. After a customer checkout, another random (I think) product is added to the invoice. The total amount charged is still the price without the added product. E.g. in the attached pic I chose to buy only the first product (audio magnet set) and in the invoice there are 2 products.

Has anyone encountered such a bug? any ideas?


Does the product you added to the cart have a “required product” mistakenly included with it?


However, this probably happened because my DB was messed up trying to set up a dev environment…

I managed to restore an older version of the DB and the problem stopped.