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If you have Area 51 followed, the network drop-down does not display the reputation for the site:
Is this an error or a bug? As with the other quirks of Area 51 mentioned in this question, it's hard to tell.
As Nick explains in this answer,
Area 51 is running on the early SE 2.0 platform and doesn't support exporting its rep to the dropdown. Not a bug. status-bydesign.