One of the issues is that when I logout and another username is showing being logged on my computer. The same is happening on the other person computer, when they are logging in or logging out it shows their username and my username. The admin password needs to be reset as well.
These are the problems I have for now.
I will suggest you debug this issue by first checking if all MyBB files are unmodified. DVZ Integrity tools can help you with that. (
https://community.mybb.com/mods.php?action=view&pid=980)
If all files are the same as default MyBB, check if your cookie settings are correct. If you wish to generate cookies, check this tool (
https://docs.mybb.com/tools/cookie-settings)
Finally, check if you are using any faulty plugins. For that, you might have to manually disabled and enabled plugins.
Hope this helps you in finding the issue.
Regards
WallBB