when i view source for the page, the id hidden element does not have a value:
<input type="hidden" name="cupcake1_1_ID_Add" value="">
double check that you are using the correct column name for the ID:
<input type="hidden" name="cupcake1_1_ID_Add" value="<?php echo $row_rsCaterBreakfast["PRODUCTID"]; ?>" >
in the form tag, it refers to the ID column with an underscore?
<form name="cupcake1_1_ATC_<?php echo $row_rsCaterBreakfast["PRODUCT_ID"]; ?>