drive comes up with multiple paths

NBU master: 7.1.0.4 on HP-UX 11.31

NBU server: Windows 2K8 R2 64bit, 7.1.0.4

issue: We replaced a tape library and used same robot number, a few drives came up with two paths, i removed the extra path from JAVA console, but after restarted media services, the extra path came back.

From "tpconfig -d", i also see the extra path.

Is there any way we can remove the extra path?

thanks,