Hi,
You would have put your KF1 under Fiscal Year umbrella in KF section of your query. In this scenario, what ever other KFigures you add, those will also be fallen under the same umbrella.
So you need to create 12 Kf s for all months by restricting with the respective months and then you add KF2. So totally you will have to create 13 Kfs.
Regards,
Suman