I ran 10 times, the miss rate is very high in subsequent calls, supposed to be 0

hits=0 misses=2784 total=2784
hits=177 misses=2607 total=2784
hits=337 misses=2447 total=2784
hits=412 misses=2372 total=2784
hits=533 misses=2251 total=2784
hits=638 misses=2146 total=2784
hits=817 misses=1967 total=2784
hits=767 misses=2017 total=2784
hits=783 misses=2001 total=2784
hits=910 misses=1874 total=2784

looks like every run added a few more hits