To me this is weird but I'll keep a look out for it. I have 3 spellcasters that go to the Realm separately. One is a Virtuoso, one is a Master .. and one is just starting out, but I feel like I've spent a lot of time there and all three of the Sages are always there. Although I do see them walking around in the other neighborhoods, fishing ect.. when I'm out and about.
I play with aging off.. and I don't have any mods in my game. Could this be a mod conflict? Or a story progression thing?
My save is also an older one so maybe (?) the bartenders ect have already been chosen in my save, that's the only other thing I can think of.