Why can't I sign in from my computer? I can use my account only from my cell?

I can use my account only from my iphone.
But for some reason every time I try to sign in from my laptop the same question keep coming which I never added?

"What is your youngest child's nickname?
Added September 18, 2009"?
What can I do about it?

That is a secondary authentication question. Web sites are adding them for extra security. It's triggered when the site sees a computer it doesn't recognize (or it's cookie has been deleted from). Answer the question to proceed.

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