so im trying to 100% the maps but literally nothing is greyed out anymore, i tried walking everywhere and im stuck at like 96% on most maps. are there some hidden areas that arent on the map or something?
Since other players might ask the same question:
first of all please name the map and send a screenshot.
the reason for this is most certainly a tiny part of the map you did not explore thoroughly. on the map it looks like you explored it, but you might have missed a couple of steps to reveal it fully on the map.
there are some maps that have areas which are hard to reach or hidden - not the starting areas, though 
hope that helped.
West siauli Woods is one of them, my bad.