You are missing a triumph for it. You show the kills but not that you ever completed the quest.
[quote]Complete the quest "The Ascent" and collect its Grenade Launcher reward.[/quote]
https://www.bungie.net/en/Triumphs/254/3779777?root=1024788583&parent=3685363199&category=3718048310&subcategory=2000731733&recordSort=0
English
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You're right what the heck. How was I able to claim The Mountaintop the day before Shadowkeep released then?
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not sure, but based on the triumph, the game thinks you didnt, that is why you cannot find it on any character or in collections.