Do you know why my federal tax due/owed window and my business profit/loss line don't change as I enter business expenses in Schedule C, but only continues to read $0.00?

Do you know why my "federal tax due/owed"" window and my "business profit/loss" line don't change as I enter business expenses in Schedule C, but only continues to read "$0.00,"?  I have already entered the income, from 1099s received and other sources, and entered several areas of expenses. But at some point, the "federal tax due" window remained constant at $6,000; and the "profit/loss" line remains constant at "$0.00" - that is, it seems like it ought to show a loss, but it doesn't. Can you think of a form or a "check-box" that might relate to this problem?