The reason why the "Oni to Tengoku" prequel only got 169 votes is because back in 2021, Mangago reset it to 0 or altered it to be lower. Every comic back then got reset or altered because the authors kept posting this site on Twitter and pointing out how much this illegal site had a lot of readers. Also, back then, you could see how many people viewed a manga, and there were over 500k+ people who viewed it, which the authors would also point out. So then, Mangago had to remove it.
example, this manhwa had 15k votes before but now it only has 500+
https://www.mangago.zone/read-manga/puppy_love_eumnya/
screenshot of the previous votes
http://aminoapps.com/p/mdgc7r
882 voted
https://www.mangago.zone/read-manga/koimonogatari/
5033 voted
http://aminoapps.com/p/9qmxuj
are the mangago ratings accurate or is my site tweaking? backlight has only 167 votes but it has over 100 pages of comments while oni to tengoku kyuu which is a sequel has over 500 votes?? im confused