Did you calculate losses? Because there evidently should be a few losses to settle at that amount. Losses can be declared against gains (and even carried forward for several years to deduct taxes paid on future gains).

I'm not sure how that number was arrived at, but it seems to be just focusing on the gains (and each event as was mentioned above). Maybe consider taking a closing total? Accountants don't bother calculating each and every trade because all that matters is what's left at the end. Unless of course you can claim commissions as tax deductible.