Several years ago I had a strange issue where I somewhat lost a lot of my map progress in a few of the reserves. The map showed completely unexplored for me. If I got within a hundred yards of an outpost or structure I had previously unlocked/built, it would then update and re-unlock. However, POI's would always stay green, even if I tried to open up their text.
This issue happened on Layton and I believe Parque and/or Cuatro, perhaps others. It didn't affect all reserves for some reason.
Even now that I have discovered most things again, POI's and landmarks still stay green and won't unlock for me, no matter what. I would really like to be able to discover the whole map.
Is this a known bug and is there a way I can solve this?