Peter,
First, for the App ID being the same, *please* make sure you test in a lot of browsers with that. Since RSEvents is still initializing the Facebook Javascript library, and since browsers all load things in different orders, make sure the login works properly in all of them. It hopefully will, but just want you to be careful.
Next, I just looked at your site. In the top right, if I shrink the window just right, this is what I see:
If I widen the screen, the "Change the color" stuff still overlaps, but isn't so bad.
Wanted to point that out. If you need help diagnosing/fixing that, just let me know.
Now.. to your actual question
Try adding the following to your stylesheet:
.scuser-menu {left: -20px; }
You'll probably need to adjust the actual value, but hopefully that gets you started. If not, you know where to find us.
Thanks,
Alex