Last year(YE 2024), while filing taxes for my wife, I ended up with a tax bill over $10,000. It did not make sense but we had liquidated a bunch of shares and ETFs and I was not sure how capital gains was calculated. 

Later in the year, I noticed that the T5008 entries were duplicated. I was not sure how that happened and chalked it up to my mistake. However, this year, I just downloaded my slips from the CRA and I see that the system has duplicated the T5008 for me.