09-23-2011, 10:11 PM
I've had this occur as well. If they disappear in your backpack, just add 1 of that particular reagent to your backpack from your reagent bag and the stack will appear. I've lost a few stacks to invisibility on the ground as well. It's a little buggy, but as long as you're not overloaded, there is a way to get them back 