diff --git a/web/template/syzoj/problem.php b/web/template/syzoj/problem.php
index c80ade3..6d1a1ae 100644
--- a/web/template/syzoj/problem.php
+++ b/web/template/syzoj/problem.php
@@ -523,7 +523,7 @@ if ($pr_flag) {
               })
               markdown_content = md.render($(this).html());
           <?php } ?>
-          $(this).append(markdown_content)
+          $(this).html(markdown_content)
         });
         // adding note for ```input1  ```output1 in description
         for (let i = 1; i < 10; i++) {