POI / CITY Visibility issues

has anyone figured out how to make some of the POI/CITY markers appear consistently?
I have created some packages with numerous City markers, and some (at random) do not appear in the sim from certain approach direction and distances, while most of them seem to work from 3 - 5 NM from all directions. I do not see any settings in the POI / CITY section when adding. I have tried doing multiple “packages” with the same city but the visibility problem appears to be geographically related as the POI / CITY from both packages behave similar. anyone seeing the same problems, and have the solution. or is it a bug in the core app?