HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

It's clear that this is related to the fact that the settings are reset during the HD update, and before the player selects the monster strength, it defaults to an incorrect value (which eventually converts to 5). The game supports a monster strength of 5, but it cannot be selected through the game interface.
If you remove the line "" from the _HD3_.ini file and don't touch the buttons for selecting monster strength, they will again be set to 5, and the sawmills will be guarded in the skirmish mode. The other guards will also increase because of this.