Dependents E Emptions

I am single and i have no dependent and i am supporting myself and i am not supporting anyone.Based on w-4, my tax exemption number should be 2.I know that i can enter any number here and it will increase my tax withholding if i put 0 and will reduce it if i put bigger number but the exact number should be 2.But when i filled out my tax using turbotax, i see that in 1040 form in.