Go to your TAX RETURN review and then scroll down the left side menu. Do you an Item called 'Net Capital losses other years' ? It's on this page that I see that the system has correctly applied my carryforward amount (loss) to offset my current year gain.
Note: I used the CRA autofill feature so it pulled this info in automatically. If you didnt use that feature then I would think you need to add that info in as described by Nawal further up this page. Hope this helps.