diff --git a/questiontype.php b/questiontype.php
index 31fc1e8..3051f91 100644
--- a/questiontype.php
+++ b/questiontype.php
@@ -152,7 +152,7 @@ public function save_rows(stdClass $question, array $columnslist) {
                     $answerslist[] = $c + 1;
                 }
             }
-            $questionrow->correctanswers = implode(',',$answerslist);
+            $questionrow->correctanswers = implode(',', $answerslist);
             $questionrow->feedback = $question->feedback[$i]['text'];
             $questionrow->feedbackformat = FORMAT_HTML;
             $questionrow->id = $DB->insert_record('qtype_oumatrix_rows', $questionrow);
@@ -225,7 +225,7 @@ protected function initialise_question_rows(question_definition $question, stdCl
                         $anslabel = 'a' . $column->number;
                         $correctanswers[$column->number] = $anslabel;
                     } else {
-                        $correctanswers[$column->number] =  '1';
+                        $correctanswers[$column->number] = '1';
                     }
                 }
             }
@@ -288,7 +288,7 @@ public function get_total_number_of_choices(object $questiondata):? int {
     public function get_num_correct_choices($questiondata) {
         $numright = 0;
         foreach ($questiondata->rows as $row) {
-           $numright += count((array)$row->correctanswers);
+            $numright += count((array)$row->correctanswers);
         }
         return $numright;
     }