My child is 18, still in school. The under 17 child tax credit is automatically applied. How can I fix this?

If I change her dependent type, TurboTax removes my HOH status, says I’m not eligible because I do not pay over half the cost. I pay 100% of her living costs. This seems to be a glitch. I should be able to claim a dependent and HOH.  I fully qualify under the rules.