Unexplorable Remnant Area on Eos

Only ruins connected to vaults will turn blue on the map. The Remnant have many ruins throughout the galaxy, and that's all they are, ruins. The vaults are open by activating 3 monoliths. That's how it works. Those are the only ones that turn blue on the map. The rest are simply ruins. Sometimes you can find remtech at the ruins, sometimes not. The civilization is decimated. Only story related monoliths are added to the map. There I said 3 times that should explain it.

But the Remnant Areas which we are talking about also turn blue on the map when you've explored them (say, you find a chest) As you can see on the very first picture I've provided, there are 3 Remnant Areas, 2 of them are blue and the one I've marked with a red circle is not. Which it is a bit strange when some Remnant Areas turn blue and others don't.

The Voeld main vault place, after I did it (and I think grabbed everything... I followed a walkthrough), didn't turn blue after completing it. That a normal bug for people?

If its the one I think it is (it's near the area that has the ore sample for the quest and for the data trail quest) - it never turned blue for me (the only one that didn't)
It is involved in a quest - the one where you save the idiots that are trying to tame the remnant bots.
It's off a terminal in Prodomous (can't spell that lol) In the room where you meet the asari for Coras quest.

It's there to mess with your OCD fore it will forever stay white. muwhahahaha