Dry Steppes Dungeon 20/21 With Achievement?

I’m grinding out the renown for the extra paragon. Going through Dry Steppes dungeons, the achievement pops up saying I got all 21 powers from the dungeons but the renown page says I’ve only cleared 20/21.

Is this accurate and I’m missing one somewhere or is this a bug with the renown page?

The top half of this image is my achievement that I earned tonight and the “Side Dungeons” is what the renown page shows for the region.

https://i.imgur.com/csgSATr.png

I’m also experiencing this issue.

I’m playing it on Xbox One and I’m seeing it there as well.

The achievement takes into account dungeons you’ve done across all characters/seasons. So maybe you did the one you’re missing before?

I would use codex of power to find which one you’re missing rather than the achievement.