I have the same issue. Logged off 2 days ago with 14,000 glimmer (approx.), did nothing, logged on the next morning with 4,000. Thought to myself: "maybe those upgrades cost more than I thought?!" So, I used several consumables, got up to approx. 8,400, and double checked this number directly before bed. Logged off, went to sleep, woke up the next morning, had 977 glimmer. There is clearly a glitch bungie is not addressing. I can't imagine how many times this has happened and I did not notice. Seeing how its an Iron Banner week this is really frustrating; I've been trying to save 20,000 glimmer to buy both feet and the shot gun, and it's very difficult when you loose approx. 17,500 every two days..... Let's see what happens tomorrow!