I expect that the issue is that you see that you are reporting in your income tax return $17K of net capital gains, but your own input of security sales only amounted to a gain of $5K.
Understand the capital gains included in your income tax return can originate outside of your own trading activity. The most common place these "other" capital gains come from are from 1099-DIVs, (e.g., mutual fund distributions) and Schedule K-1s. Go and look at your actual Schedule D where capital gains from all sources are compiled. That will clear this up.
Tom Young
