are you looking at your refund or income taxes which would be the income tax on your taxable income + self-employment tax
based on the info you supplied, the box can you be claimed as a dependent should be checked. As a dependent, your standard deduction would be limited to your net earned income (wages and net schedule C income) +$350. the maximum standard deduction is $12,200.
there is an earned income credit that is not allowed if you can be claimed as a dependent.
so if you answer Yes, I paid for more than half of my living expenses with earned income, your standard deduction would be at the maximum and you would get the Earned Income Credit. lower net tax higher refund
if you answer No, I didn't pay for more than half of my living expenses with earned income, your standard deduction could be less than the maximum and no Earned Income Credit, higher taxes smaller refund.
if this is not what's happening, then likely there is something wrong. We can't see your return so you may need to contact support
