Somehow got these packs, bug or exploit?

Yesterday, i bought garden warfare 2 on steam and played for a couple of games. I checked out the sticker shop but then noticed i had over 80 gifts and when i checked the gifts, i had a lot of twilight chomper packs? Each pack didn't give me twilight chomper but gave me almost a million coins and random items. Before playing, I've linked my account to my playstation account and received the real twilight chomper pack that ive bought on the ps4 version of the game and the deluxe packs from the edition i got from steam. I wonder if an exploiter that I've played with gave me those packs without my knowledge or is it a bug?