Dear Kangjoo,

The modified AAL template which ships with NIAK is based on a gray matter segmentation. It includes all voxels with substantial overalp with grey matter at the group level, which turns out to be quite extensive. You can try to restrict the regions to grey matter at the individual level. You have the individual segmentation results in the anat folder, which you will need to resample at the functional resolution. 

I hope this helps. Best,