I have that too.
I believe that is due to the change of presets storage locations between old and new Logic versions, and possibly also with old and new version of GB and MS.
For instance Jam pack used to be optionally purchasable, now some are included in the factory library...
LogicX 10.5.1 ( & 9.1.8),MainStage3.4.4
MBPro 17", Core2Duo, 8G, OSX 10.12.6
MacPro, Xeon 6Cores, 64GB, OSX 10.15.5
ULN8, MOTU MIDI TP-AV, C4, MCU Pro, KorgNano, Novation SLMkII
AAS, NI, Celemony, Spectrasonics, Korg, etc...
PC, iPad3(V-Control & LogicRemote), AtariST(Notator SL), Several vintage gear