Research Efficiency through edicts seem to give more % than what is displayed

with the modifiers it should give +85% which for 48 base means 88,8 Research/60 but here its 97

from what i can tell the modifier for population works correctly but the one for the edicts is slightly off

i think i know whats causing this, the bonuses are multiplicative and not additive? (so 48 * 1,45 * 1,40 instead of 48 * 1,85)

Yes, as you've said, they are multiplicative

If they are, it should be made more clear because it says + not *