As far as I know, this is not a bug. I’ve noticed this too and have tested it with various values. In my case, the decreasing the values to about 60% (0.6-0.65) actually worked wonders. It improved the shape of the FSC and the overall features of the map. I’m attaching some examples of what tests I ran and although I did not use the values that you see here finally, I do clearly see the effect. Also, having a tight cutoff (for ex: 0.4-0.41) is generally speaking detrimental.
