The total income from selling that you will report and be taxed on is the proceeds of the stock sales less the associated cost of them. The proceeds of stocks sold to cover taxes would be included in the Form 1099-B.
The proceeds of the investment sales is $27,280.26, the total in the first column of the first worksheet. The cost of those sales may be the cost basis reported on the Form 1099-B, or it may be something else. That same worksheet lists the dates acquired and dates sold. It appears the first row shows the stock sold to pay taxes, as the proceeds and cost basis are about the same and they were sold one day after purchased, so no gain is involved there which is typical. That would explain the approximate $6,000 discrepancy between what the proceeds were and what you received.
The second and third rows appear to be stocks acquired and then sold several months later. It may be that the Form 1099-B lists the correct cost basis of shares sold, but it may be wrong as often it won't factor in the income entered on your W-2 form. The only way to be sure would be to add what you paid for the shares, if anything, to the income reported on the W-2 forms. Since it seems you sold all of the shares, that would give you the correct cost basis.
As mentioned by @MarilynG1 you can adjust the cost basis if it is wrong on the Form 1099-B entry.
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