Bungie has informed the Destiny community that there is a bug in the system that can make you loose your Armsday Orders. Bungie is suggesting that you ONLY redeem Armsday orders within the Gunsmith’s Turn-in Oorder window. They are working on getting a solution and permanent fix on this matter.
Bungie is investigating issues impacting Armsday Orders. Do not attempt to redeem orders from character inventory: https://t.co/k4JI1SWnii
— Bungie Help (@BungieHelp) September 30, 2015