Hello. Shaders have to be in your inventory or vault to be "discovered" and available to claim from your Collections. It doesn't count if it's applied to an item. You'll have to get more via the Eververse storefront.
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i had this shader in my inventory before i applied it. I can't get it more cuz i dont know how to get that "Midnight Talons" now
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Collections wasn't implemented until the Warmind expansion came out. If you had used all of that shader before that time, then it wasn't in your inventory for Collections to register. Eververse sometimes sells old shaders for Bright Dust, so check her stock each week.
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