The IBM Tape Library object is displaying 32 Libraries, the majority of which are old libraries that do not exist anymore.
A display of libraries from the lpar shows just 5 libraries:
LIBRARY CLASS SYSTEM= 1 2 3 4 5 6 7 8 9
PH1DVTS1 TAPE + + + + . + + + +
PH1DVTS2 TAPE + + + + . + + + +
PP2DVTS1 TAPE + + + + . + + + +
PP2DVTS2 TAPE + + + + . + + + +
PVCL01M TAPE + + + + . + + + +
Where is vantage picking up the 32 libraries from?
The old entries were still defined into the MVS catalog.
The command: listcat libraryentries(p2atl1) all , permits to locate for one library the old entries.
Purging them from the catalog will fix the display result.