It's the dark grey of the pistol and background. The automatic system doesn't know it's taking pictures of something dark. Point the same camera at a big wedding dress and the picture will be underexposed. Somewhere in the menus, or on a good camera a button will....Well, for one thing, you overexpose your pictures. But other than needing to stop down about 2EV, you seem perfectly normal.
Wait, I'm off topic. Nice pistol!