Archangel's staff / Manamune bug on watch.lolesports.com

I have noticed a bug on the stats part of the lolesports website. When archangel's staff/ manamune upgrades into seraph's embrace / muramana, it disappears from the item menu in the stats but fails to put in their upgraded counterpart afterwards. Any Ryze/Ezreal/Kai'sa game is proof of this claim. Although not the most important worry for the dev's currently, it may be helpful to know of and would reduce headaches of people who look at the stats window.