Someone else may have discovered this, but I'm afraid reading through all the problems already identified might take the rest of my lifetime.
I uploaded a new observation:
I clicked on the first of the other observations listed and got this:
https://www.ispotnature.org/communities/uk-and-ireland/view/observation/751438/black-ebony-in-the-desert, which resolved into an error message.
The second listed observation led to another error message, in some way related to a Zambian giraffe:
Clicking on the third observation did lead to a previous observation, prickly, but hardly in the same league:
The last three observations worked properly.