Shaper guardian compass disables influenced map drop chance from atlas

Hi, I've been running few formed invitation sets with shaper guardian map compass and noticed I'd started getting less influenced maps. That means no conqueror or elder maps (mostly from invitations, rarely from maps). I think that it also removes Shaper guardian map drop chance, since I didn't get any additional ones, only the guaranteed maps from compass and few from invitations. I am not running Singular focus.

On average, I am getting 1.5 influenced maps per set with compass (not counting compass drops), 2.9 IM per set without compass.