Once (with previous T) I came and the client's chair was in a slightly different angle than it always was, I immediately thought about it and felt a bit uncomfortable and I told T like: oh, I see that a chair is on a different angle than usually and he said that I can change it if I want to but then I thought that I was ridiculous and just moved on...

But I think it happens to many clients - once I entered the office of my current T and the emdr machine was much closer to the client's couch so probably it was used just before, I just looked at it and my T immediately asked if she should put it back to the "right" spot, and I was like "no, of course not, I don't care, why do you ask actually?". Thus, I guess for some of her other clients, it might be a problem but I might be just over-thinking...