I have same problem.
“ERROR: The username or password you entered is incorrect. Lost your password?”
This text is translated but in frontend there are no translated words.
https://ibb.co/f1nQdnS
https://ibb.co/hfcP70x
I found problem on this file:
wp-content/plugins/wordfence/modules/login-security/classes/controller/ajax.php:210
