It has to do with a faulty glitch in username identification. The same thing happens if you have an underscore at the end of your username and you try to reach your profile but get to someone else's.
Example: Santi_ santi Those are different users. Sometimes both profiles will open and sometimes santi's will only work.
I know it can't be fixed, but the least the staff could do is to remove the option of using an underscore upon registration.
That won't work. Someone suggested that a long time ago and I think the reason it wouldn't work was because all the accounts with underscores would be deleted.
No, like, when you create an account it currently says under the username bar 'letters and numbers' or something of that kind. You could add in 'don't use underscores' to that.
