'All over the map’ is used many times, in many different ways to describe conversations, thoughts, emotions, even political promises that are not consistent, or regular.  They even might be unpredictable

他們天南地北什麼都談，卻沒有一致的主題及看法。

Map 是地圖；而 all over the map 表明許多不同的地點或方向，分散各處，有極大的差異。此語，可指討論內容，眾說紛紜，或各說各話，莫衷一是。