Hey Akin, you should check out this help article: [url=https://www.bungie.net/7_Sometimes-I-use-an-Ammo-Synthesis-pack-and-it-does/en/Help/Article/12282][b]Here[/b][/url].
It is likely occurring because your consumable inventory is full, empty some of the stacks into your vault and try again.
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Thank you! Works fine, very much appreciated.
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No worries :)