I will day that I'm struggling to align these survey questions with human nature as I understand it.
I have a friend who "wants kids" and two different women, when they reached a certain age in their 30s, signaled they wanted to marry him and have kids.
But they both exhibited red flags that caused him to decline. One woman didn't act like she liked him, even though she was also saying she wanted to settle down together.
The other woman was unwilling to discuss how they'd raise the children given the fact they were from different religious backgrounds.
Given he's now in his 40s he'll likely never have kids.
I suppose if he was super passionate about kids he'd enter an unhappy marriage and make sure he got some kids out of it, before possibly ending up divorced.
So wanting children was more a conditional thing than a binary thing, and I don't know if these surveys can capture that.