The amount varies, can go upto negative 10 or more at times.
Most recent example
2 line items purchased. 1 of each
Item 1. 1 in stock, 1 purchased. Item went to -1 (negative 1) should gave gone to 0 in stock
Item 2. same as above.
Item requires stock is turned ON
Shopping cart is turned ON
Another example
8 Items purchased. 1 of each
2 items went to negative 2 (-2) & 1 item went to negative 1 (-1). Other 5 items were ok.
Can PM you admin user & password to take a look?
Kind Regards,