Entry under Other Income Taxes

I am self-employed (have no W-2s) and receive income from which no federal or state taxes are withheld. Same holds for investment and dividend income. I make quarterly tax payments which appear under "Estimates" in the Deductions & Credits tab, but here's my question: Why is there an entry under Other Income Taxes in this tab? None of what is listed under the Learn More popup applies to me? Where did this figure come from and how do I get rid of it?