Why are Sts. Peter and Linus not on the cool scrollbar-of-the-popes on vatican.va

I was about to add a glib comment in answer to another post in a act totally unbecoming of a stackexchange moderator, when I noticed that the effect would have been completely lost on the OP owing to https://www.vatican.va/content/vatican/it.html ending with Cletus, what happened to "Linus, Cletus, Clement"1. I could have sworn I saw Peter and Linus in this list at some point, but it might have been another page on the vatican website. What possible reason could there be for having a non-standard list of pontifs here? Do people dispute St. Linus's papacy? The notion that St. Peter was the first pope isn't a contraversial topic among vatican web developers is it? Did they run out of numbers? is the vatican website still running on a 16-bit MIPS processor? 1. I love saying "Linus Cletus Clement"