It is possible that there were mistakes originally made delineating the land, so that each house was not built in the right spot, but each encroached on the neighbor's land, until finally the actual land situation no longer fit the survey map.
例如前面提到的新店「奇案」，當初可能因為鑑界有誤，每棟房子都沒蓋在自家土地上，卻往鄰界土地「位移」，造成圖、地不符。