Thank you for your patience and providing your token. I looked at your file and was unable to determine why QuickBooks entered the negative value of 1,935 onto your Schedule C. When we get a sanitized file, it is sometimes difficult to determine the source of a particular figure. As you can see from the screenshot below, the description is marked off and I could find this amount no where else in your tax file. It transferred directly from QuickBooks and since I do not have your QuickBooks file, I cannot trace it.
The 1,935 may be related to some type of reimbursement or credit that you received during the year. Does that sound familiar to you? If so, it is correctly reducing the amount of your expenses on your Schedule C.
In any case, you might want to contact QuickBooks directly for additional support. You can find their contact information here.