Retirement tax questions

I have the same question.  After entering a W-2 for a non-qualified plan, after the "Let's check for uncommon situations" page (for which I checked "none of these apply"), TurboTax asks, ""Did you take money out of your nonqualified pension plan? We just need to check whether the $xxxx in box 11 is money you contributed to your plan, or if it's money you took out of your plan." 

 

I don't understand: if it is money I contributed to my plan during the tax year, why would it show up as W-2 income at all?