The nominal hike is not the raise
A 10% raise against 6% inflation is not a 4% real raise. Purchasing power is a ratio rather than a difference, so the correct figure is 1.10 divided by 1.06, less one - 3.77%. Subtraction is the calculation everybody does in their head and it flatters the raise at every positive inflation rate, by more as both numbers grow.
That gap is small at ordinary numbers and large at the ones that matter. At 30% nominal against 6% inflation, subtraction says 24% and the real figure is 22.6%. Over a career the difference compounds into a materially wrong picture of whether your pay has actually moved.