My question is about 'De avonturen van Pim & Pom' (a Dutch children's show): https://www.thetvdb.com/series/261764. The season/episode list is incomplete, and likely incorrect. However, there are very little official sources to be found, so I am unsure how to proceed.
There currently are four season with a total of 40 episodes (10/season). According to the official site of the creator of the series, there should be 2 seasons with 26 episodes each. The existence of 52 episodes is confirmed by the cover of a collection dvd in the official webshop (https://www.fiepwestendorpwebshop.nl/en/dvd-pim-pom-de-complete-serie.html).
In October 2009 the first series of 26 episodes of The Adventures of Pim & Pom was ready. The second series of 26 episodes followed in 2011. A total of four DVDs has been released, each containing ten episodes.
-- Source: https://www.fiepwestendorp.nl/fiepamsterdam/en/pim-pom-bv/.
At first I thought that the current order is the dvd order from 4 dvds that have been released with 10 episodes each (referenced in the quote above), but according to an image from the official site, the dvd order is also different: http://www.pimenpom.nl/upload/afleveringen_dvd.jpg. Basically, I have no idea where the current episode numbering came from.
I want to add the remaining 12 episodes, but I can't find any official sources that list the 52 episodes in order. The closest I can find is from Videoland (a 'Dutch Netflix'), which lists 52 episodes (and a 53rd bonus episode that corresponds to a bonus episode on dvd 4): https://www.videoland.com/series/943/pim-en-pom, though they don't divide them in two seasons.
I'm also unsure if I should reorganize the series in a major way without approval/advice.
How should a situation like this be handled? Should I reorganize the episodes based on the only source that lists 52 episodes? If so, would one or two seasons be preferred? If I shouldn't reorganize the series, how should I add the missing 12 episodes?
Thanks in advance for your help!