You would need to look at each entry on the form 8995 and investigate which ones you feel are incorrect.
You need to keep in mind that the qualified business income (QBI) deduction is very complex and as such may contain provisions that you are not familiar with. For instance, the QBI deduction cannot be more than 20% of your adjusted gross income before the QBI deduction. Also, you must subtract any self-employment tax or IRA/SEP plan contributions from your business income to arrive at your QBI. Also, your deduction can be limited by your income and the nature of the work you do. You must also factor in prior year used business losses. It is not as simple as taking your business income and multiplying it by 20%.
Here is an article that you may find helpful:
QBI deduction