Just to get it straight: The "double arrow" was on your Carbonite minimized map. It was the "player arrow" that was doubled, and you were not talking about Blizzard's gold arrow (that shows up on Carbonite's minimized map when the maps are merged).
Well, I'm glad you got it straightened out. I, personally, don't have that problem (or I've never noticed it, at least
) so I couldn't help you out. Not that I'm any Carbonite expert, or anything like that, but I am glad that you got it fixed.
By-the-way, Carbonite's player arrow
ALWAYS points in the direction that the players' character is looking. The Blizzard arrow points in the direction of how you have your Blizzard quest watcher set up (and it doesn't
HAVE to be visible for this to take effect).