--- /Users/matt/Downloads/ubercart/uc_attribute/uc_attribute.admin.inc
+++ uc_attribute.admin.inc
@@ -1071,10 +1071,10 @@
   foreach ($form_state['values']['body'] as $value) {
     if (!empty($value['model']) && $value['model'] != $form_state['values']['default']) {
       db_query("UPDATE {uc_product_adjustments} SET model = '%s' WHERE nid = %d AND combination = '%s'",
-        $value['model'], $form_state['values']['nid'], $value['combo_array']);
+        $value['model'], $form_state['values']['nid'], ksort($value['combo_array']));
       if (!db_affected_rows()) {
         db_query("INSERT INTO {uc_product_adjustments} (nid, combination, model) VALUES (%d, '%s', '%s')",
-          $form_state['values']['nid'], $value['combo_array'], $value['model']);
+          $form_state['values']['nid'], $value['combo_array'], ksort($value['model']));
       }
     }
     else {