I don't know if it's a clone of anything,but I still didn't really find an answer. On Ubuntu, the Ambiance theme works perfectly fine, except on nautilus. Files selected inside nautilus show as grey, as if the window isn't focused, even when it is.
The selection rectangle, however, retains the orange color
On the desktop, it seems to have the right theme
I tried other themes too, and the only one in which it doesn't seem to happen is Adwaita. Is it something in the theme itself then? How can I correct this? I can't seem to be able to find an answer.
-Amir P.S. While these pictures are taken in gnome shell, the same happens under unity.