I've been following this thread while I've tried a new game on hard with few people and until today everyone bred pretty much how your chart says. TODAY though there's a weird one.

Mom #21 and Dad #11 had a #7 child.

I had bred the same father with 2 different mothers at the time and the first one was right around the correct number in your chart. The mother that had the #7 child was a first time mother and was the second one of the two to breed.

I only have 22 people and 3/4's of the way through the game, so I haven't bred that much

Is is possible when you breed the same man to two different women that they somehow "warp" the possibilities?