How do I check my Eligibility for the Earned Income Tax Credit? Turbo Tax changed its mind about my refund for no apparent reason.

I was almost done reviewing my return, ready to submit, when I hit the back button and my refund amount (fed) dropped by $1,500 for absolutely no reason.  I was showing as eligible for the Earned Income Tax Credit, but now I can't find it anywhere in TurboTax.