tablets effect increasing for rituals

hello, my question is about ritual +rerolls stat and how is it affected by atlas passive nodes for 8% increase tablets effect (4 nodes) and doubled tablets effect ?

because sometimes when effect is doubled i got 18 rerolls, but i cant understand why 18

the setup is - 1tablet +3rerolls, 1 unique rit tablet x2, +1reroll from ritual atlas tree and 1 reroll is default.
also i got 4 nodes with 8% tablet effect increase and node with 20% chance tablets effect will be doubled

so with this setup i got 10 rerolls ( (3+1+1)x2=10) and that means those 4 atlas nodes with 8% increased tablet effect are not working

why then with doubling effect i got 18 rerolls?
so math is (3x2+1+1)x2=16 .... why 18 ? ofc unique tablet "twice as many times" cant be doubled as there is no number, but words.

same when 2 tablets with +3 rerolls used - then with doubling i got 30 or 32 rerolls i dont remember exactly, but 30 for sure
but (3x2x2+1+1)x2=28 - so no way i can get 30 or more

and with those numbers it cant be that 32% tablets effect increase works


so what is the right math for tablet effect increase with ritual rerolls?

It's the way the game does the rounding that is confusing matters.

Your tablet that gives 3 rerolls is giving
3x1.32 = 3.96
This get rounded down to 3.
So (3+1+1)x2=10.

When you hit the the tablet double effect you get
3x2x1.32=7.2
This is rounded down to 7.
So (7+1+1)x2=18.

With 2 of the reroll tablets.
Again 3x2x1.32=7.2
This is rounded down to 7.
(7+7+1+1)x2=32

was thinking about rounding that it works on 32% also... but looks like not ).... now it's more clear, thx.