This morning I opened 1 booster I got from the Mastery Track. In that pack I opened a Baron Strucker, HYDRA Overlord. I have chat logs of myself talking with a friend about the potential of that card for my Brawl deck. Shortly after that I used gold to buy 10 regular boosters and pulled a second Baron Strucker, HYDRA Overlord. As I was opening packs I was writing a message to my friend listing the most interesting cards and mentioned the second Strucker. Correctly, when I opened the second Strucker the display did not say "NEW" over the card. However, now when I look in my collection I only see 1 of them. This has happened before: I'm supposed to have 2 Living End, but there's only 1 in my collection. Now I wonder what else is missing. Unfortunately, I restarted Arena before noticing the missing Strucker, so I don't think the Issue Report log I'm attaching covers the right time period.