AWN doesn't take into account which is the primary display (nor let you choose which one to use)

[Teo]

I have two monitors. In the X server settings i set them in "twin view" and I choose to extend the desktop to both monitors (have one on the right of the other rather than clone it).

There may be 3 reasonable behaviors of AWN, in order from best to worst (but still acceptable):
1. Let you decide in which screen you want AWN
2. Always place AWN on the PRIMARY display
3. Consider the desktop as a whole so depending on the value of "position" it may "fall" into one or the other screen (this would only make sense if the bottoms of the two screens are aligned).

Instead, AWN does NONE of these. What it does is it ALWAYS stays in the LEFT screen, no matter which one is the primary display, and there's no way to put it on the right display.