According to CRA "you have a capital gain when you sell, or are considered to have sold, a capital property for more than the total of its adjusted cost base and the outlays and expenses incurred to sell the property."
You most likely haven't sold anything that year to trigger a capital gain or when you did the proceeds were less than the adjusted cost base.
Example of capital gain during a sale
Note: ABC is an adjusted cost base
Let's assume ABC is 200 and proceeds is 300
Proceeds subtract ABC gives us 100 capital gain
Example of no capital gain during the sale
Let's assume ABC is 200 and proceeds is 100
Proceeds subtract ABC gives us negative 100 which is considered as a capital loss instead of capital gain
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