I haven't been able to check all of them yet, but it appears that they should indeed be under each of the series and not specials. 2017's entry also has an article describing it as a series finale. I also noticed that names and placements are consistent with the Wikipedia page List of Have You Been Paying Attention? episodes, so it appears either the Wikipedia page was influenced by this or, more likely, the other way around.

I checked 2017's final episode on tenplay through the Wayback Machine and it appears that not only was it not a special, it was also just called Monday 27 Nov rather than Have You Been Paying Attention to 2017? as it currently stands. Network 10 (or whatever it was called back then) was, and continues to be, the original broadcaster, so these seem to be the original titles. None of the other episodes have been named on TMDB so I'm not sure what should be done with them all. I'd guess they should all be called their original titles (all 2017's should be called, for example, Monday 11 Sep for S05E19, etc., and the Have You Been Paying Attention to 20xx? should be the same).

The names are interesting though. 2021's episodes called theirs, Have You Been Paying Attention? - S9 Ep. xx with 2022's series shortening it to S2022 Ep. xx, lengthening the names back to 2021's format once selected. I don't know whether these even classify as episode names or whether they should be used for each episode. I can't even find reference to where the name Have You Been Paying Attention to 20xx? has been used as an official name.

I'm unsure where there is functionality to move episodes between series' (with this discussion page stating it isn't possible as of December 2022). Manually creating new ones and deleting old ones sounds like a pain, so hopefully there is another option. Would appreciate a mod weighing in on what they think is best.