Sometimes you need to refresh the Identify page if it’s been open for a while, I believe because the authentication token expires. I usually keep a pinned tab open to Identify, and if I don’t use it for a day, none of my IDs are added, and I need to refresh the page.
EDIT:
To clarify, when you load a page, we use an authentication token that expires after 24 hours. So if you try to make an ID, comment, etc, after the page has been open for more than 24 hours, it won’t save. You have to refresh the page.
The exception is the web uploader - the token expires after 24 hours, but if you try to submit observations after its expiration we’ll show you a pop-up and allow you to refresh the token without losing your work.