Why is my iTunes doing this?

Do you drag the window down before you quit – you know, shuffling windows around?

No I don’t really shuffle windows unless I’m working on something and even then I try to use Spaces, I never move my iTunes window because I really have no use in moving it, it’s always did it on it’s own and it usually happens when I plug my iPhone in.

I have also seen this kind of behavior when using Spaces, especially with MS Office; I think it’s a bug with spaces, plus I use multiple monitors of different resolutions.

Do you run another monitor at any point? I’ve noticed that can sometimes cause it. Atleast on mine, if I had something open in the monitor, and then the monitor isn’t present when I turn on the computer again, and bring open that particular application, it might be in a different place.

No, I am a simple Mac user, I use it for movies, photos, and developing applications.

It looks like it’s simply centering the window. Is your dock auto-hiding?

Nope

I’m with sndfreQ, spaces is a candidate. It’s really buggy.