Saturnav causing maps to decrease.

[schmendrikc]

I am finding that since acquiring Saturnav, creating glass monuments will cause my maps to decrease in number by one, instead of increasing.

[eternaldensity]

Saturnav does this:
this.power = Math.floor((Molpy.groupBadgeCounts.monumg + Math.pow(8,(Molpy.groupBadgeCounts.diamm ||0)) +1 - Molpy.mapMonumg)/3);

TBH I don't know why that is or what it's mean to achieve. Can anyone explain this?
Molpy.mapMonumg seems to be a constant of 200.