It's unwrapped correctly, I think something happened when I switched textures half way through and didn't unwrap it again. I should have just used clouds stretched along the board's long axis. This was a five-hour render so it is what it is, not going to do it again
Option, that you will rerender it again didn't even come to my mind. I was thinking about your future projects/renders. I didn't notice something like that on your previous interior render, but there parts of the floor were closer to each other.