Password must be at least 4 characters long

[eXo]

So yesterday I created an account by doing "exo_M" and entering my pw, everything went fine, but today, when I tried logging in (with just exo), it said that my password must be at least 4 characters long. The thing is, my password IS at least 4 characters long, in fact, there's alot more than 4 characters in my password. I'm guessing my small username might have something to do with it.

So please, can someone fix this for me? I'm willing to change my username. Thanks in advance