VeniceFindMarkers only.pos parameter not working?

Hello,

I am trying to find the marker genes of a certain cluster with respect to all other clusters in my Seurat v3 object.  In order to do this, I would have to set the only.pos parameter to TRUE or else I would get also markers of the rest of the clusters.  However, when I do this, I still see negative logfc values.

Thank you 