I've been thinking I was losing shards; i.e., a stack of 4 would become a stack of 2 while away on a mission, but that was really hard to notice. I specifically count shard stacks because I need 12 to make a seasonal "merge shards" achievement, and I keep thinking I used to have more Sicarius Shard V than I currently have but assumed I was misremembering between missions or sold two by accident instead of storing them.

Just now I watched two full stacks of 20 intel become a stack of 20 and a stack of 18, while storage was closed and I was using the shard forge. So, that's really frustrating. I'm not super worried about the lost shards, except I need 12 for a seasonal achievement.