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Just looked at it, and yes is strange but not impossible, HOWEVER read below.
The below screenshots show that 9994 to 10000 are all missing. This is simply NOT possible in this reality.
The maths show is possible but very improbable
% to roll 9993-1000 Rolls
0,6977991% 10
6,7629034% 100
29,5398270% 500
50,3536401% 1000
75,3523895% 2000
87,7633586% 3000
93,9249530% 4000
96,9839603% 5000
98,5026461% 6000
99,2566183% 7000
99,6309380% 8000
99,8167742% 9000
99,9090350% 10000
99,9548392% 11000
99,9775793% 12000
99,9888689% 13000
99,9944738% 14000
99,9972565% 15000
99,9986379% 16000
99,9993238% 17000
99,9996643% 18000
99,9998333% 19000
99,9999173% 20000
50% of users will hit the range 9993-10000 in around 1000 tries.
This seems very strange but the post I've made here
https://bitcointalk.org/index.php?topic=5045277.msg49125605#msg49125605 was about a site
without scam
and here
https://bitcointalk.org/index.php?topic=5045277.msg48004767#msg48004767 this guy seems to have proven this site uses different hashes and scam their users.
I'm not saying they are not scamming since they change hases, I was talking only about the variance in a not cheating probably fair game.