Quite the contrary for me:
7 stratis on 9/21
4 on 9/20
5 on 9/19
2 on 9/18
3 on 9/17
Seems a bit random, as someone said before "luck" plays a role.
Both pow and pos needs some luck, sometimes bitcoin is mined by solo mining, so you can see why luck is also a part of mining/staking.