Map Reseting

Hello There,

Yesterday I almost discovered the whole map (well, the whole region that is available to us).
Then today, when I logged in, I saw that the map only saved the city.
The whole map is once again blacked out, as if I never discovered it.

I don't know if this it intended or not.

Note : I discovered the map while soloing the game. Then I had a brief MP session, and logged out. Don't know if this is related or not.