Your carpet was specially ordered for you and is likely to be from a different production batch to the one the sample was taken from. Slight variations between batches are normal and must therefore be expected. We regularly check carpets against the samples to ensure that each batch is a satisfactory match and within the legal tolerance. As well as batch variations, differences may be due to different lighting or the effect of the surrounding d’cor in your home, or it may simply be the effect that is common to all carpets which makes them look slightly different according to the angle from which they are viewed.