Thank you for raising the issue.
I have read through that link. I suppose its loosely plausible the "age" weighting is such that my game shows up very low, but I would be quite surprised if the normal popular was weighted to that degree. And after a quick perusal their are other games first launched in 2023 plenty high up the list.
I do not think there is doubt that this is a bug of some kind. Look at #1 and last place on those two lists.
https://itch.io/games/tag-incremental/year-2022
https://itch.io/games/top-rated/tag-incremental/year-2022
The question is, what kind of bug and in which system. And if it is systematic, or if it will go away by itself. Like a one time loss of data due to some mishap.