That's what my guess was. At first I thought it may have been the week 2 vendor version compared to week 1. Most people who bought week 1's are not seeing any issues... I bought week 2. But I've seen enough people from both sides have issues.
I understand the drops aren't guaranteed after "X" amount of kills. This is understood. What I'm saying is, for some, they work all the time as intended... for others, they do not. I know you can't calculate whether they are bugged or not. Read the responses in here "mine work great!" etc etc... What I'm telling you is, for some people, like me, they never work. Not sometimes, never.
Your response will be "well even if they only work once out of 100 strikes, they worked that once! rng!"... but you see why that may not be working as intended correct?