Explored map bug/problem HEEELP!

[PudgePlaya001]

Ok, I have this problem when I start a custom game. The map is explored from the beginning of the game without the usual 'fog of war'. When I also go to the map options at the right (before starting the game) that says 'hide terrain', 'invisible' etc, everything works fine except the 'default' mode which is the normal one. However, I tried a campaign game and its ok (the map is hidden at the beginning) unlike custom games. Anyone encounter this before? Please help, thanx

Edit: This is for Warcraft 3 FT