More Button from the Episodes Page sometimes has bugs

Sometimes when there's a "50 more" button to display the remaining episodes, you click it but it doesn't add the expected number of episodes and what it adds are in fact episodes that were already listed just above and are now duplicates. Finally a new More Button is shown but when you click it nothing happens...

Here are some pages where that bug occurs (my language setting is English / United States):

https://www.imdb.com/title/tt0891396/episodes/?year=2012

https://www.imdb.com/title/tt2604124/episodes/?year=2016
https://www.imdb.com/title/tt2604124/episodes/?year=2017
https://www.imdb.com/title/tt2604124/episodes/?year=2018
https://www.imdb.com/title/tt2604124/episodes/?year=2019
https://www.imdb.com/title/tt2604124/episodes/?year=2020
https://www.imdb.com/title/tt2604124/episodes/?year=2021
https://www.imdb.com/title/tt2604124/episodes/?year=2022