[Freesurfer] Clusterwise correction

Dear Freesurfers,

I am doing a vertex-by-vertex analysis on a label, using mri_glmfit. As a result, I got a very small cluster (62 vertices) at p<0.01. Then I tried running clusterwise correction using the following command:

mri_glmfit-sim \ --glmdir fMRIfaces20.glmdir \ --sim mc-z 5000 2 mc-z.pos \ --sim-sign pos \ --overwrite

I am a bit surprised by the result: one cluster is reported in mc-z.pos.sig.cluster.summary, and it is bigger than the one previously identified.

Could this be correct? if not, what could I be doing wrong?

Please find attached mc-z.pos.sig.cluster.summary and mc-z.pos.j001-lh-try-ctr-dys2.csd.

Thanks very much in advance, Irene