I see... you have a lot of add to cart buttons on the r.php page.
You can do it with a find and paste I think.
Find:
$ATC_itemQuantity = floatval($ATC_itemQuantity);
if (is_numeric($ATC_itemQuantity) && $ATC_itemQuantity != 0) {
$Progs->AddToCart($ATC_AddIfIn, $ATC_RedirectIfIn, $ATC_itemID, $ATC_itemName, $ATC_itemDescription, $ATC_itemThumbnail, $ATC_itemWeight, $ATC_itemQuantity, $ATC_itemPrice);
and replace with:
$ATC_itemMisc = "";// column binding
$ATC_itemQuantity = floatval($ATC_itemQuantity);
if (is_numeric($ATC_itemQuantity) && $ATC_itemQuantity != 0) {
$Progs->AddToCart($ATC_AddIfIn, $ATC_RedirectIfIn, $ATC_itemID, $ATC_itemName, $ATC_itemDescription, $ATC_itemThumbnail, $ATC_itemWeight, $ATC_itemQuantity, $ATC_itemPrice, $ATC_itemMisc);
The idea is you have to add this line if it isn't there:
$ATC_itemMisc = "";// column binding
and then update the $Progs->AddToCart() call to include it at the end as well for each add to cart button on the page.