I've been having trouble with 3dgroupincorr results. The mean levels of connectivity are in the range of 3-4, very far off from the expected -0.99 to 0.99. All the individual scans have normal instacorr connectivity maps, so it's not a problem with any scans. Any help clarifying would be appreciated!

The setup input, from cat of the niml file:

<3dGroupInCorr
nvec="902629"
ndset="13"
datum="byte"
nvals="2@546,550,3@546,496,546,2@542,3@546"
fac="0.00102691,0.00128431,0.000898239,0.000926104,0.000946642,0.000980695,0.00125302,0.000506849,0.00086272,0.000839428,0.000530713,0.001106,0.000609429"
geometry="MATRIX(2,0,0,-90,0,-2,0,126,0,0,1.999941,-71.99734):91,109,91"
datafile="passive.grpincorr.data"
dset_labels="01slfunc.nii.gz;02slfunc.nii.gz;03slfunc.nii.gz;04slfunc.nii.gz;05slfunc.nii.gz;06slfunc.nii.gz;07slfunc.nii.gz;08slfunc.nii.gz;09slfunc.nii.gz;10slfunc.nii.gz;11slfunc.nii.gz;13slfunc.nii.gz;14slfunc.nii.gz"
commandline="3dSetupGroupInCorr -prefix passive 01slfunc.nii.gz 02slfunc.nii.gz 03slfunc.nii.gz 04slfunc.nii.gz 05slfunc.nii.gz 06slfunc.nii.gz 07slfunc.nii.gz 08slfunc.nii.gz 09slfunc.nii.gz 10slfunc.nii.gz 11slfunc.nii.gz 13slfunc.nii.gz 14slfunc.nii.gz"
prep="normalize" />