can't see all drives up

hello,

can you please help me, i have a media server that is correctly zoned with a Quantum Tape Library, Solaris OS, in OS level all 24 drives are seen correctly, but when runing tpconfig -l i see only 13 drives, i tried tpautoconf -a, restarted nbu, deleted all drives an scan again, always same result only 13 drives seen on nbu level.

thanks a lot for you help.