Well i think your arhive was compiled with 9 characters.
if you want and can compile the arhive again..get the arhive from geteggdrop.com , then untill you use ./configure , go in the director src using cd src , then pico eggdrop.h and look for set ..handle or NICKMAX 9 then replace the 9 with 12.then type cd .. and compile the egg again and you will have the nick with 12 chars.
well if you cant compile the arhiva again..a solution is to add the user like this : the user is BLaCKShaDoW - > .add op BLaCkShaD
then the host will be *!*@BLaCKShaD.users.undernet.org
then use .delhost BLaCkShaD *!*@BLaCKShaD.users.undernet.org (removes host)
and the use .addhost BLaCkShaD *!*@BlaCKShaDoW.users.undernet.org (adds host)
These are the posibilites