Hey everyone,
We're aware of an issue where your other event packs are automatically opened if that pack opening interface is exited (whether intentionally or not).
The other items are still added to your collection however, so nothing is lost.
I did take a quick look over everyone's recent pack purchases and openings here, and fortunately this is the same situation. I'm showing all purchased packs were opened and had their contents added to the account correctly, even though some seem to have been done in the background.
Apologies for the concern here, but you should be able to pull up your collection to take a look at the new additions as the actual pack contents have been added to the accounts correctly.