So I think this is the right place to put this. Something I discovered tonight. I finished my first RoN run this week and tried to purchase a red boarder shotgun. I went in, and the shotgun was grayed out. I went into my inventory to clear a weapon, and I had 2 slots open. However, my kinetic weapons were full. I deleted a kinetic weapon, and the shotgun was made available for purchase. It's not a huge bug, as deleting or moving the weapon via DIM seems to fix it.