Class should be nil if "row"

src/section.lisp

@@ -47,7 +47,7 @@ Example:
     (:p \"Section content goes here\"))"
   (let ((final-class (combine-classes
                       "mb-3"
-                      class
+                      (if (string= class "row") nil class)
                       (make-col-class nil xs)
                       (make-col-class 'sm sm)
                       (make-col-class 'md md)