I just completed the weekly quest from Xur for an Exotic Cipher, then headed to the tower. Once there, I went to the Banshee first and had noticed it showed I had only 85 Gunsmith Materials, when I had well over 2,000. I then noticed that I couldn't buy Enhancement Prisms as it showed I had 0 Seraphite, when I should have 700-800 or so. Then I went to the Monument of Lost Light to use the Exotic Cypher, and no longer have it either. I'm not sure yet what all else I've lost, but massive amounts of items in my inventory have disappeared. I've closed the game and restarted my Xbox, but the items are still missing.