I am unable to duplicate this in a stock installation of Zen Cart 1.5.x with the latest version of "Ultimate URLs" installed...
Tested with "Display Product Add to Cart Button = 1" and "Display Multiple Products Qty Box Status = 1, 2, or 3"
Tested with "Display Product Add to Cart Button = 2" and "Display Multiple Products Qty Box Status = 0"
In both cases the correct product was added to the order and no extra products were added to the order.
The "query terms" such as products_id are not added by this module (Zen Cart's core and your template control these).
Are you running an older version of Zen Cart or this module? How is your store different from a stock Zen Cart installation?
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