You mean for tax year 2018.
There is probably an entry error for the income you reported, either a misplaced decimal point or a comma entered by mistake.
Look at your entries for income in the W-2 section and in the sections for entering a Form 1099 if you received a Form 1099.
TurboTax support FAQ for Head of Household - https://ttlc.intuit.com/community/family/help/do-i-qualify-for-head-of-household/01/25539
