Password changed... or not?

Hello! I share an account with a friend of mine, so that we can seperately activate the server for ourselves and our other friends in different timezones. This has worked perfectly fine in the past, and as far as I can tell, doesn't break any rules. We've previously had no issues of any kind.

Recently, however, I've learned I can no longer access the account via login. According to the login system, I've been entering the wrong password, despite using the same one I've been using in the past, and for some reason, my friend can access the account with no trouble. On a whim, I asked the friend to change the password to see if that would work, and they did. After the change, I entered the new password, and it still came up as incorrect, while when my friend used the password, it worked just fine.

I've cleared my cache and cookies, used a VPN, used different browsers, tried the mobile site instead, anything I could possibly think of to try and get it to work, and nothing has. There doesn't appear to be an issue with the server itself, as it functions as it should under normal circumstances, and while this isn't a dire circumstance, it's very confusing and a little baffling to find this happening only just now after several months of no issue.

Any answers or assistance that can be offered would be extremely helpful, thank you in advance.

We both use the username "gayran" to login.

We compared that to each other again just now. Using that username, they can login, but I cannot. We confirmed that the exact same password they type in to access it is the one I've been using that the login system tells me is incorrect.

However, they just changed the password again, and for some reason that worked. So... welp!

Thank you very much for trying to help, I hope I didn't waste too much of your time ^^;