This almost happened to me again today, so I tried to reproduce it.
If you go through things really fast the click seems to not register at the right location.
https://youtu.be/bYhyEYT3j4s (happens around second 10)
I installed the Microsoft Mouse Highlighter from their PowerToys to highlight where the click happened.
My suspicion was that when I click a package and VERY rapidly move my mouse away from that package the click ingame may register later and open a different package.
The bottom left movement is natural since that is where you need to click to claim the free package.
What you can clearly see on second 10 in the video is: I clearly clicked the free package and the Gungan package opened.
No idea how this happened. Also can't really tell since when the game is not registering clicks at the location and time they happen. Maybe it correlates to some changes that were rolled out recently? I can't recall an earlier instance of buying something wrong. And I do click through the stupid repetitive stuff very fast to save myself some time and brain cells.
I think this can be split apart into 2 things: A bug for not registering clicks properly in the app, and.... a service ticket because I did not expect this to be a thing and not double checking if the free package I clicked on was ACTUALLY the free package.
I hope you can see that flushing 50 bucks worth of crystal down the toilet is not a good buying experience.