This is normal: the Guest role is a standard feature of Moodle which is created during installation. Do not delete it. Please read the documentation on how it works and how to use it: https://docs.moodle.org/311/en/Guest_role
Logs can track users who arrive at your front page. Since they have not logged in yet, they are still a guest user. What you are seeing in the logs is the actions of users who have forgotten their passwords, failed to login, and are resetting them. Once logged in, of course, their actions will be tracked in the logs with their actual user ids and not that of the guest user.
Logs can track users who arrive at your front page. Since they have not logged in yet, they are still a guest user. What you are seeing in the logs is the actions of users who have forgotten their passwords, failed to login, and are resetting them. Once logged in, of course, their actions will be tracked in the logs with their actual user ids and not that of the guest user.