I'm no Windows fan, but Windows 10 is the first where I don't actively hate the window manager. Well, I do hate how it keeps moving all my windows to the left side of the desktop. Not sure why that is happening. So I guess I hate something different about it now.

You mean it's snapping to the left half after some action? That would probably be when you press Windows+Left-Arrow, happens to me sometimes when I try to do Ctrl-left for example.

It's generally when I unlock the screen after waking up. I have no idea if I accidentally pressed Windows+Left, but it's doing this very consistently.

sounds a bit like a driver issue, like it changes the screen resolution during wake-up. you should figure out whether it's the exact size used for half-pane snapping (which sounds like userland issue), or whether it's some other size.

I don't think it's the size for 'half-pane snapping'. It seems a faulty screen resolution change on wake-up might indeed be my problem.