The 1099-B shows covered (company knows the cost basis) and noncovered (company has no knowledge of the cost basis) stock transactions.
You should enter the correct cost basis you know you have to complete the correct gain or loss on your sale/transaction.
It is normal for some transactions to have no cost basis when the company does not have all the data from purchase to sale. This can happen when a person changes financial agents for example.
There is no issue to be concerned about when entering the correct data.
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