Is Indigenous Military Outposts bugged?

[QuintusSertorius]

I cannot answer that, but will see if we can set a more detailed description for the effects...

Right, looking at the Building Browser, higher tiers of the Indigenous Military Outpost require 20% then 40% Eastern Imperial culture, so it seems a good bet that's the source of the issue.

Has it been mistakenly inserted in the building roster in place of Metoikia Katoikon (Foreign Military Settlers)? I can't build that in Massalia, but it's a requirement to upgrade to Supervised Hellenic Administration.

In fact I can't build those anywhere; I wonder if Epeiros has the wrong kind of settlers/outposts?

EDIT: And as a quick addendum, since destroying that Hellenistic Polities is climbing again - though Eastern Imperial isn't falling (yet, at least).