Redis-cli intrinsic latency

Why does the intrinsic-latency results keep on increasing over the time?

./redis-cli --intrinsic-latency 10

Max latency so far: 1 microseconds.
Max latency so far: 9 microseconds.
Max latency so far: 10 microseconds.
Max latency so far: 12 microseconds.
Max latency so far: 53 microseconds.
Max latency so far: 80 microseconds.
Max latency so far: 175 microseconds.

Why does the max latency keep on increasing over the time? Shouldn’t it hover around an average value?