Tax Reporting Germany: calculation of transaction fees

How are the transaction fees calculated? The amount reported in the tax report is almost double of the total fees for ALL trades/transfers/purchases etc. on the full data set for the year (column M on the excel report). How can i check if the tax report is correct?

Fees are deducted from the proceeds and internal transaction fees are not deductible by the german tax law. We are working on the fee structure and you will get a better overview of all fees paid and how they are calculated.