Big box store layouts

Can anybody in the know explain to me why every Home Depot or Lowe’s has a completely unique layout? Who decides which aisles go where? You would think for a store that’s so vast that it would be more efficient for everybody involved to keep a consistent setup. I’m going to assume that they actually want you to get lost so you wander around and stay in the store for longer.

Sometimes I walk in and I forget which store I’m in. I start moving towards a section based on my internal map of the store, only to realize halfway there that I’m in a completely different store and I’m going the wrong way.