I have the Gossen Profisix, which I believe is the rest of the world version of what you have.

There is a little green button in the same recess as the big red button, if that is pressed the needle swings straight to the right side of the scale, if the battery is charged and the meter is switched on.

On the right side of the meter scale is a green rectangle, the needle is supposed to swing to there when the green button is pressed, indicating the level of battery power, or charge.

Is it possible that the meter has the little green button stuck somehow?