Is this Computer bug or TurboTax is not good at math?

Error message comes back even I entered correctly. Is this computer bug?

>The sum of box 52 and box 53 (T3) must equal the total capital gain or loss in box 21 of your T3 slip. Please review your imported data.<

I entered same number made made sure 52 + 53 = 21, still error message appears. 

Can I leave as is, then can I NETFILE without problem?