We cannot tell you. You have not provided enough information. We do not know if you have dependents, we do not know your age, the kind of income you received, etc. etc. etc.
When you prepare the return by hand---what is different from the one prepared using the software? You can see your Form 1040. Which lines are different?
PREVIEW 1040
https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing
Click on Tax Tools on the left side of the screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.
It depends on what kind of income you have,
If you have capital gains or qualified dividends the tax is not taken from the tax table but is calculated separately from schedule D. The tax will be calculated on the Qualified Dividends and Capital Gain Tax Worksheet. It does not get filed with your return. In the online version you need to save your return as a pdf file and include all worksheets to see it.
For the Desktop version you can switch to Forms Mode and open the worksheet to see it. Click Forms in the upper right (upper left for Mac) and look through the list and open the Qualified Dividends and Capital Gain Tax Worksheet.
You can probably tell because the tax on 1040 will be less than the Tax Table