Bump ! I have the same problem (on PS4). I think the bug came when l loaded a ammo synth while loading screen in battle (during/after death). We saw many times some ammo synth packs consummed (with cooldown timer) but without giving ammo if used while loading and not into action. The bug lasted for days (very rough when you do VoG daily...). I have tried to change swap by another rocket launcher or to change the weapon type by using a machine gun (with no effect). I tried to reboot destiny and after to reboot the PS4, without effect too. I will try to make some room in my inventory (at least one empty slot), but it's seems to be a common problem (many of my team mates have already see it at least one time), so please FIX IT !