Incorrect username or password message but actually logged in

Hi!

– login page url is changed
– 2fa is activated except for the whitelisted ip
– no other security plugins installed apart from Cerber

When haven’t logged in for some days and trying to login from the whitelisted ip I get the message:

“Incorrect username or password” still on the login page.

But then if I go to my url (www.example.com) instead of login in again, I see I am logged in and Cerber’s activity doesn’t see the reload of the login page with the message “Incorrect username or password”.

Any clue what it is or how to fix it?

Thank you ??