When I press ← Back in Firefox in the AU review queue, I can usually view the post I’ve just reviewed together with votes of other reviewers. However, sometimes, the post is not shown again.

This time, it happened on https://askubuntu.com/review/low-quality-posts/982726. Even reopening the link in another browser tab does not help.

I’ve just encountered this problem the second time already (the first time happened last week IIRC), so I’m asking: What does it mean? Is it a bug, or feature?