@love1994-
were they listed on your tax return? there could be a number of tax credits missing (EITC and CTC) if you failed to list the dependents?
Also, it is surprising that if you used TT, it used SINGLE instead of HOH. There are just too many questions that TT asks to end up at the wrong place. if you have three dependents can you share some information on them?
is it possible that SINGLE is correct? for example, you have 3 children who lived with you ONLY from August - December. You can not file HOH in that circumstance.
suggest using this link to confirm that HOH should have been the filing status.
https://www.irs.gov/help/ita/what-is-my-filing-status
