“Incorrect username or password” message but actually logged in

Hi,

– login page url is changed
– 2fa is activated except for the whitelisted ip
– as far as security plugins are concerned, only Cerber Security is installed to perform the above

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 logging in again, I see I am apparently logged. So in essence I’m logged in but get the message “Incorrect username or password”.

Any clue what it is or how to fix it?

Thank you ??