I would like to clear what Daxum has stated.....
The bugs you are seeing is cause of the missing maps in the map folder on your emu server.
Follow these instructions and those issues you have will vanish. The reason for those issues is the maps give the server the distance between players and mobs for argo to see if they are close enough to argo. Second when you cast a spell the server calculates if you are not to far way to cast the spell on your target.
Go here
http://sourceforge.net/projects/eqemulator/files/
and download Maps.tar.gz first and then new_maps.zip and extract them in order to your server directory under a folder called maps.
Your Vallon Zek / Tallon Zek Prior GM
Voidd the Returnless