Not sure if anyone else is having this problem, but I purchased 21 of those Xunlai electrum from the trading post to finish the second part of aurora. I started at the beginning and worked my way through, skipping bitterfrost, cause elixir. When I got to lake doric, I went to where I thought the mastery point was, only to find that i was incorrect, or so I thought. I ended up going to all the mastery points, and when none of them worked, I decided to move on to the next one on the list in draconis mons. I went to that mastery and it didnt work there either. I then looked in my inventory, and realized I didn’t have any of the xunlai electrum left. I thought that was weird cause I was sure I had 21. Anyway, I went and purchased my remaining 4, returned to draconis mons, and also completed siren’s landing. I went back to lake doric again and when I went into my inventory, the two remaining xunlai I had was gone. So it seems that each time I enter the map, it keeps removing the stack from my inventory. Thankfully I’ve only lost 6 of them to this bug, and not an entire 21. Still, I’m at a 40 gold loss right now.