line 63 is the binding for the description:
$ATC_itemDescription = "".$row_WADAproducts['ProductShortDesc'] ."";// column binding
your recordset does not include the ProductShortDesc column in the select statement:
SELECT ProductID, ProductName, ProductImage, ProductName, ProductLongDesc, ProductPrice, ProductDimW, ProductDimH, ProductWeight, ProductDimD, ProductStock, ProductUnlimited FROM products
edit the recordset to add the ProductShortDesc column to the select statement.