fix bug

@@ -406,9 +406,9 @@ class Command(BaseCommand, LoggerMixin):
                         else:
                         else:
                             sheet_name, key_field, side_field_order, field_order = self.field_map[result[self.CLASSIFY_KEY]]
                             sheet_name, key_field, side_field_order, field_order = self.field_map[result[self.CLASSIFY_KEY]]
                             if key_field is not None and key_field in result[self.RESULT_KEY]:
                             if key_field is not None and key_field in result[self.RESULT_KEY]:
-                                head_fields = [b for _, b in side_field_order]
+                                head_fields = [a for a, _ in side_field_order]
                             else:
                             else:
-                                head_fields = [b for _, b in field_order]
+                                head_fields = [a for a, _ in field_order]
                         row = []
                         row = []
                         for field in head_fields:
                         for field in head_fields:
                             row.append(result[self.RESULT_KEY].get(field))
                             row.append(result[self.RESULT_KEY].get(field))