How does 55% chance of group contributor + Double Talent event not = a perfect chance of doubling??

So you go into a raider mission, you equip Negan, both Herschels, and Maggie, all fully powered up. So that's 55% chance accumulated. Now the game adds an event in which your chances of getting group contributor are doubled. That should equal 110% i.e. a guaranteed doubling.
Yet it doesn't.
What gives?
Yet it doesn't.
What gives?
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Since every other talent is cumulative (2 seconds plus 2 seconds crippling leg shot equals 4 seconds, not 2 chances of 2 seconds), this doubling talent should also be cumulative unless it has specifically been set not to be.
It would be nice if the doubling were cumulative vs individual. Using NG math, the full double heroes and NSMG gives you an 84% chace of doubles.
1-(.6*.6*.7*.8*.8) =.839
https://forums.nextgames.com/walkingdead-ow/discussion/44652/team-with-multiple-scavenger-or-contributor-talent-how-does-it-work
Contributor Talents/Mods
Legendary Hershel: 4
Legendary Maggie: 3
Negan: 2
Princess: 1
The Governor: 1
Eugene Porter: 2
Yumiko: 1
Hershel Greene: 2
Daryl's Crossbow:1
Negan's SMG: 4
https://nxtg.ms/OWCardResource
Thought this information should also posted here (it's easier to find):
let us take a deeper look in the percentages of the best doubler teams:
without event:
0,85x0,85x0,9x0,9x0,9 -1 (best team and weapon with double coins)
~47,3% chance of double coins
0,8x0,8x0,85x0,9x0,9 - 1 (best contributor team and weapon)
~55,9% chance of double board progress
so how does it looks like with the event? Instead of double the complete percentage, each separate percentage is doubled: 15% goes to 30%, so 0,85 goes to 0,7.
0,7x0,7x0,8x0,8x0,8 -1 (best double coin team and weapon with event)
~74,9% of double coins with event
0,6x0,6x0,8x0,8x0,8 - 1 (best contributor team and weapon with event)
~83,9% chance of double board progress
As you may see, it's nearly impossible to get 100% of the doubler effect, but it's clearly a huge boost.
Even if you had 4 heroes with 90% chance to double you won't get to 100%.