Aw yes. Forgot about that. That must be it.
The Standard Deduction for an individual for whom an exemption can be claimed on another person's tax return is limited to the greater of:
…..$1,100 or
…..Your earned income for the year + $350 (but not more than 12,550)
So you would get a minimum of $1,100 to a max of 12,550.
See the 1040 worksheet on page 33
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf
