Given the somewhat complex operating 'modes' of this camera, I'd suggest doing a bit more research around the web before assuming something's wrong. I've had similar experiences with mine and initially thought something was wrong and was ready to return it for repair. But then found someone that, for example, the camera behaves differently at low or high f-stops, depending on shutter speed. I'm slowing learning how this little beast works, but it doesn't come quickly!
I don't have mine with me at the moment, and so can't try to duplicate your problem now. I'll check back tomorrow to see if someone was able to help. Good luck.
Go outside and talk to someone today.