What are those values right to the itemsets (for example [A=1]:18)
If they are absolute support as I thought, why are they different for same items in different rules ?

[A=1]: 18 ==> [B=1]: 6 <conf 0.33)> lift 52.63)
...
[B=1]: 38 ==> [A=1]: 6 <conf 0.16)> lift 52.63)

Clearly I'm missing something here,
I really hope you can help me please.