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What version of the game do you have? Are there any other maps or mods (I've asked this several times)?
This is your problem. Portals are placed correctly (the hero can visit anywhere, meaning they can essentially create a portal anywhere).
Don't forget that the mod is for multiplayer!
Okay, I hope it's just me.
I played "Warlords" (with 8 players, standard settings). There are mods (mods for the number of players, for showing heroes in the selection mode when creating a map).
Regarding portals: I mean that if the player can choose the locations for the portals, then, for example, it is possible to move across rivers.