You are using this when displaying your category description:
<?php echo((strpos($WADbSearch1->whereClause,"Category_Description"))?$row_WADAproducts['Category_Description']:"Descrption goes here"); ?>
I think you want:
<?php echo((strpos($WADbSearch1->whereClause,"Category"))?$row_WADAproducts['Category_Description']:"Descrption goes here"); ?>