In some cases when you are trying to provide consent for the content of members that you recently added to your group, you might see a pop-up that displays the login area and prompts you that you are already logged in.
The reason you are getting returned to the login page is due to the fact that the member in question is not verified.
For a Group Manager to set consent for Group Members, the Group Manager has to be GM-verified and the group member has to be verified as well. In cases where the member is not yet verified, the Group Manager cannot provide consent.