only do it for non-flex version

scss/_type.scss

@@ -138,6 +138,7 @@ mark,
   }
 }
 
+@if not $enable-flex {
   // Clean up some horizontal `<dl>`s built with grids
   // scss-lint:disable QualifyingElement
   dl.row {
@@ -146,3 +147,4 @@ dl.row {
     }
   }
   // scss-lint:enable QualifyingElement
+}