Can't to change my E-Mail-adress & PASSword...

Something strange is happening here... As You can see, I'm was connected with my account correctly, which means that I typed my LogIn & PASSword correctly, right?.. But then I've trying to change my E-Mail-adress... I was doing all OK but anyway get the message: "Password (You have given an incorrect or inactive user-name, or an invalid password)"... So I've tried to change my PASSword but just can't to do this too: "Wrong old password"... I'm log out... Log in again... There is all OK, the system accepted my PASSword... But so far I just can't change my E-Mail-adress or my PASSword...