Area Of Effect calculation is off? in Poe 2

i just noticed that Increased Area Of Effect For Attacks calculations are wrong. or atleast it does not show it correctly.

i noticed on Shattering Concotion which has an Explosion Radius of 1.5 Metres.

i Invested into Attack Area under the ranger class. which says 8% Increased Area Of Effect for Attacks.

if my math is correct shouldn't 1.5 * 0.08 = 1.62? or rounded down to 1.6?

the same applied to Herald of Ice. which has 1.8 * 0.08 = 1.944 again rounded down to 1.9 but it's still 1.8

only when i added the second node Attack Area that gives another 8% it became 1.6 and 1.9.