Deductions & credits

thanks @rogge1722  ,yes I see how turbo tax calculated - gross rental and capital gains income 

but I get error message if I do not 

Enter any positive or negative adjustment below - turbo tax accepts my total gross income, gross rental income and gross sale price for property. Not sure why system is not calculating this but when I input this amount - it lets me proceed to file.    Is this right or why would I  need to make an adjustment to the figure Turbo tax calculated?