I would have listed this under U for URLs changing.
This is not off topic. It is a reply.
NOTE: this is in the bug catalogue as Bug #423 Observations displaying in wrong community.
and also possibly:
Bug #430 URLS ("What is the point of the url: having ~/communities/southern-africa/view/observation/~ Why can it not simply be - https://www.ispotnature.org/view/702057".)