You could ignore this report. For the determination of gains for tax declaration you just have to fill in the attachment SO the fields - 43. Sell price ("proceeds") and - 44. Investment costs ("cost basis").
For the calculation of gains your trades and income (and possibly spends) are taken into account, but not "General Deposits and withdrawels". This is why this view differs from balance/dashboards views. In those views these transactions are included so that your holdings are correctly shown.
This report is not wrong, but might be confusing. But this has no negative impact on the gain calculation and the associated tax calculation.
If you disable on the "Realized and Unrealized Gains" page the highlighted Checkbox you have the same result:
The calculations are created from the same basis.