The way the data is presented often causes some confusion... let me try to explain.
What the table shows is actually like a "histogram" of how many SMs are grouped together, not which group the SMs are in. In your case, about 2/3 of the time there are 5 SMs, and 1/3 of the time 4 SMs are grouped together. Occassionally, you get 6 together.
There's a good thread discussing this here.
Hope this makes more sense.