Guild Wars 2

I had 81/82 Hints completed, and all that was left was to get on a PvP Trebuchet; After doing so I was given the hint. The Hint Icon on the top sparkled briefly like normal and the Achievement was still saying 81/82. Even the Hint Menu is completely checked off, and all 82 Hints in each sub-menu were checked.
I’m just going to assume it’s a bug & post it here, as I doubt there’d be a special way to have it recognize your hints.

Use the Treb in the Mists and not in WvW