Mods by fktifzobr.

What exactly did you fix?

The icons for the Fortress have incorrect numbers.
This is because the incorrect paths are specified in the buildings themselves - the Fortress uses the Castle icon, the Stronghold uses the Fortress icon, and the Castle uses the Stronghold icon.

By the way, this bug wasn't present in version 1.0; I remember being very surprised when I returned to the game in 2012.