CAT12 "no supra threshold cluster" in Surface based morphometry(SBM)

Hello every one,
I implemented surface based morphometry on a datasets on which I
have previously performed VBM in CAT12/SPM12. The results for VBM are as expected but, for SBM, I am getting no suprathreshold clusters in both FWE & uncorrected p value!!! I was wondering because the datasets are similar in both VBM and SBM!!
Can you help me which step of simulation is wrong that I get this result?

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@CGaser FYI