The thing is if claimed items exceed 60, the display on vendor bugs out and items never load in. This can be confirmed via Destiny 2 Companion App by opening Amanda's shop there.
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I tried the Companion App and you were right, they are shown there. Is there any wax for me to claim them?
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Nope, not until Bungie fixes this. They acknowledged the issue already, so let's hope for the fix soon.