Hi, durahij.
This might happen when you're misspelling letters.
Make sure you'll have your Caps Lock OFF.
Also, if you still can't access accounty, you should try recovering it.
If you won't be successfull you need to know that you got hacked.
This might happen due to:
-Keylogger
-Sharing password
So, make sure you'll clean up your system, or you may get all firefox / IE / Google chrome cookies stolen! (all passwords,..)
However, if you need help with removing them, feel free to contact me at my messenger. (you can see it above my user picture, post count, thanks given,..)
Hope you all the best,
m_t_h