back indenting more than once

index.js

@@ -17,11 +17,10 @@ module.exports = function(file_path, callback){
 		return result;
 	}
 	var popHTMLStack = function(html_stack, current_line_num_tabs, previous_line_num_tabs){
-		var result = '';
+		var result = html_stack.pop();
 		for(var i = previous_line_num_tabs; i > current_line_num_tabs; i--){
 			result += html_stack.pop();
 			result += html_stack.pop();
-			result += html_stack.pop();
 		}
 		return result;
 	}

test.txt

@@ -2,4 +2,8 @@ first line
 second line
 	third line indented once
 		indented twice
-	last line indented once
+		twice again
+			thrice
+				frice
+			back once
+	last line back indented twice