Irs denied all my credits

So i talked to an IRS agent and she stated that for some reason(I'm awaiting a letter and she claimed not to know) that all of my credits....child tax credits, EIC, and education credit, were all denied.

I've filed essentially the same basic return for 10 years.

Why would they deny me these credits? 

I got a "tax topic 151" notice on the IRS2GO app.