Why does logging in through the Odnoklassniki API throw Odnoklassniki to the site?

Question

Classmates

Good afternoon!
I have been using the Odnoklassniki API for a long time for authorization in my personal account on my website. Until recently, everything worked fine. About a month and a half ago, users began to complain that they could log into their personal account every other time. Sometimes, after authorization, the system throws them into their personal account, and more often sends them to their classmates page. Has something changed in the documentation?