Make sure headings clear floats in the editor.

altofocus/assets/stylesheets/editor-blocks.css

@@ -46,6 +46,21 @@ Description: Used to style Gutenberg Blocks in the editor.
 	line-height: 1.25;
 }
 
+.wp-block-heading h1,
+.wp-block-heading h2,
+.wp-block-heading h3,
+.wp-block-heading h4,
+.wp-block-heading h5,
+.wp-block-heading h6,
+.wp-block-freeform.block-library-rich-text__tinymce h1,
+.wp-block-freeform.block-library-rich-text__tinymce h2,
+.wp-block-freeform.block-library-rich-text__tinymce h3,
+.wp-block-freeform.block-library-rich-text__tinymce h4,
+.wp-block-freeform.block-library-rich-text__tinymce h5,
+.wp-block-freeform.block-library-rich-text__tinymce h6 {
+	clear: both;
+}
+
 .wp-block-heading h1,
 .wp-block-freeform.block-library-rich-text__tinymce h1 {
 	font-size: 30px;