During my raid with crota last night i lost 7-8 heavy ammo synthesis, and 3-4 special synthesis. I would use them and nothing would load into the guns. This was extremely frustrating and not to mention annoying considering it wasted almost 10k in glimmer to buy these.
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Same happen to me. What fixed it was that I had too much of the same time. I had around 60 heavy ammo synths and I had to drop two of the 20 packs.