That happened to me at Powell's on Burnside maybe two years ago and I spent like 25 minutes walking the same aisles. I was hunting for volume 4 of a series and the first three were all lined up nice, then the rest were way over by the art books because a different company picked it up later. I asked a worker and she said yeah, the sections are by publisher so it's easier for them to restock, which makes sense from their side but is a total nightmare when you're just trying to find one book. I wound up buying the wrong volume twice because of it, which was my own fault for not checking the spine close enough. Now I just check the publisher name on my phone before I go in so I know which wall to start at, saves me a ton of time. Sorry that happened to you too, it's such a dumb way to set up a store.