What is wrong with VK.com?

Every time I want to log in, I'm informed that the user data is incorrect. But they are not! I wrote down my email and password. If I change my password and the site now recognizes my email and mobile number. I changed the password. I enter it and I can't get back in. Data is faulty. That was already the case a year ago, which is why I haven't logged out for 1 year. Now my laptop is broken and I'm using another one. I wrote down all the user data. Now I can't get in again. No matter how often I change my password. He recognizes email as correct, but can't log me in. Occurs sometimes on other sites, but sooner or later the problem becomes clear to me. Except for VK. I do not understand something and therefore wonder what is wrong with this page. I can already say that this is one of the things that most freak me out, since there's no problem in my opinion.

Can't you just reset the password?

I did it. New password created and with the new one I can't come in again