It is a purposely programmed feature of Emperor, so the player is not hopelessly frustrated by changing Feng Shui.
There is also an additional helpful feature involving common housing placement. Simply rotate the map and the footprint might become green; where it was originally yellow for placement at a location, if the feng shui aura math allows.
[This message has been edited by user3 (edited 09-19-2017 @ 04:08 AM).]