I believe something has been input incorrectly.
While it may be a coincidence, based on your facts, your initial AGI of $110,000 compared to the AGI with your Sch C information of $129,000, this difference, is the same as your current year purchases of $19,000.
Based on your facts, I agree that your AGI should be the $112,000 (sales of $5,000 less CGS of $3,000 = $2,000).
I recommend eliminating all the information you have input for your Sch C and begin again going through the Q&A step by step. While the difference of $19,000 may just be a coincidence, I'm not sure that is the case here.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
