I think you're referring to the "Earliest Potential Priority Date" column, some of which are older than that? But, e.g., Patent 6,954,431 with the priority date

I think you're referring to the "Earliest Potential Priority Date" column, some of which are older than that? But, e.g., Patent 6,954,431 with the priority date of Apr 19, 2000 (i.e. more than 20 years ago), if you click through you'll see has an "adjusted expiration" of Apr 11, 2022. I'm not sure why that is, but looking in the timeline I see that "first worldwide litigation filed" was Apr 13, 2020, i.e. a week shy of 20 years, so I'm guessing they filed while it was still just barely active. And I wonder if that granted a bit more life to the patent, because it now expires two years after that.