Index: wp-admin/js/customize-controls.js
===================================================================
--- wp-admin/js/customize-controls.js	(revision 36769)
+++ wp-admin/js/customize-controls.js	(working copy)
@@ -685,7 +685,7 @@
 						// Fix the height after browser resize.
 						$( window ).on( 'resize.customizer-section', _.debounce( resizeContentHeight, 100 ) );
 
-						section._recalculateTopMargin();
+						setTimeout( _.bind( section._recalculateTopMargin, section ), 0 );
 					};
 				}