Its a bug in the game, leaving the distant POI models visible when getting close to the POI.
I cant do anything from my side here. The only solution is to reload the world, which makes the models disappear.
This bug appeared on dense maps in A18 already. (densely populated maps, and weaker systems then to increase the bug appearing)
Given the nature of the bug, it should be an easy fix (removing things when getting close is not rocket science).
But who knows if the responsible Dev is aware of the bug.