sony 70 200 2.8 overexposed problem

Hi, I just brought a used SONY 70 200 2.8 G lens, and it was exposed OK with my in door shot, but this mornings when I take it out and use it on both my a850 and a580, it is overexposed significantly, I have to set the expose to -3 and beyond. Any people can tell me if I have a lemon.

Thanks