Yes it's weird, it's like PS uses a specific color profile in it's workspace, but then doesn't save it in the files when you export them. I had the exact same problem a few days ago with the layout I'm working on for my project, it's why I replied to your message, I fixed it by playing with the color space settings, but I can't even remember the final manipulation I did to fix the issue. I think I finally created a new empty file in Photoshop with a sRGB profile (or maybe it was with no profile at all) and duplicated all my layers onto this new file.
Do you have a sample of one of the images you're using in your layout (even just a small red rectangle would do it), that way I could do some tests on my computer and see if it does the same thing and if I can maybe found the manip to fix it?
Otherwise you can visually compare the different settings by having both Photoshop and your image viewer open at the same time, with the same file open on both, that way it's easier to see if it matches or not when you pick a different profile.
