Why does average change when expanded in pivot table?

[#1]

Good afternoon,

I have an expression like this using aggr in a pivot table : avg(aggr(sum(NETWIN),LLAVE)) , when it´s not expanded doesn´t make the average well but if I expand it and export the detail to excel I calculate the average and it is ok, do you know why does it happen?

Thanks

[#2]

Its depend on Your Dimension Values.

[#3]

Please post your Dimension you are using on the Pivot Table.