diff --git a/CHANGELOG.md b/CHANGELOG.md
index 19d2ab2..208e583 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ Yii2 multiple input change log
 2.29.0 (in development)
 =======================
 - fix addind active form fields doesn't work properly in case of 10 rows and more (unclead)
+- revert changes in normalize method because it affected ajax validation
 
 2.28.0
 =======================
diff --git a/src/components/BaseColumn.php b/src/components/BaseColumn.php
index bf65c97..d4a9928 100644
--- a/src/components/BaseColumn.php
+++ b/src/components/BaseColumn.php
@@ -280,7 +280,7 @@ abstract public function getElementName($index, $withPrefix = true);
      * @return mixed
      */
     private function normalize($name) {
-        return str_replace(['[]', '][', '[', ']', ' ', '.'], ['', '-', '-', '', '-', '-'], $name);
+        return str_replace(['[]', '][', '[', ']', ' ', '.'], ['', '-', '-', '', '-', '-'], strtolower($name));
     }
 
     /**