There is no such item as mighty poleaxe in the ingame crpg files i'm guessing thats the issue, there is however a masterwork one. seems to me its not been updated to the right one in clients files. nothing you can do but wait for patch.
could maybe add the item into client files but no idea what verification the files use and no idea what the end result would be, perhaps a admin could find out.
can anyone contact admins about this?