Harmy said:
Also, at first I only saw that square as white but when I focused and took a closer look, I can clearly see those tints. Should it be obvious at first sight on a properly calibrated monitor?
Even on a calibrated monitor it can sometimes be hard for the human eye to see the difference between shades of white like that, and that's one reason why color correction can be difficult when it comes to shades of white, especially if trying to find a neutral look.
Oh, and good news about the lasers!