User login loop after added to sudoers

We installed Jenkins on our server and linked it with a Github account. The user associated with the Jenkins processes needed sudoer-level privileges. I logged in as root, ran the command usermod -G wheel $sudouser, where $sudouser was also a cPanel account. Then when the user went to the cPanel login, it would not error out, it would just reset the login over and over. (e.g.