[Freesurfer] Issue with FDR-correction

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Dear Freesurfer experts,

I want to apply FDR correction to a sig.mgh map I have loaded onto tksurfer, but noticed that the FDR-correction is inconsistent.

When I load multiple sig.mgh overlays on tksurfer and then apply FDR correction on all layers I get the following sig.mgh map for the measure I am interested in.

[cid:ee22d887-18db-45c4-86b4-134b66ce7b6c]

Whereas when I load just the overlay that I am interested in and apply FDR correction to that one layer, I get this FDR-corrected map: [cid:5df909c9-469d-490c-8af6-47cfdb74cd5c]

Is there any reason why the two FDR corrected maps are expected to differ?

Any insight would be much appreciated.

Best, Amaryllis