AP royal oak dual time problem

[kennyboyy]

Hi There,
I have just bought a used AP royal oak dual time. Model year is 2009.
The problem is even though when i self wind the watch or use it during the day, the power reserve indicator does not go up all the way. It goes up to the last section but stays in the middle of this section. So overall i would stay the power reserve indicator goes up to %80-%85 but not %100.

Anyone knows if this is normal for this model or something is wrong? For the new ones, the power reserve indicator goes up all the way but maybe for this model it is usual.

Thanks
Ken