Ask HN: Why can't I “favorite” a recent post?

The "favorite" link is misbehaving. Expected: Navigate to "favorites" page, with the just-favorited post pushed to the top. Actual: Navigate to "favorites" page, with no change to the (previously-favorited) list. Thinking I might have hit some limit, I deleted one of my 403 favorites, to no avail. Is it just me? Or maybe a transient HN issue that's failing silently? Ironically, the post I was trying to favorite is about Polar, a personal knowledge-base tool -- which is likely a better way to save interesting things than relying on HN favorites in the 1st place! Hmm, could be an interesting feature to integrate into Polar....