So I bought the Ferrikki bundle from the diamond shop. When I opened the chest all nine eggs went into my inventory. However when I used the first egg to add Levi to my hatchery all the other eggs disappeared.

Not sure what might be doing it Krin but it will definitely need looking in to.

Guess its intended, no bug here.

You only get one Eggling for a complete set of nine- Using one of them fuses the nine numbered eggs of the same set into a single eggling, like with the Windchaser amulet and Peacock charm

Okay thank you, that was not the impression I got, I got the impression there were 9 different named egglings... I might not have bought the bundle if I'd realised I'd only get one pet.

EDIT: Okay I see where it mentioned 12 names, so I guess I could have guessed with the difference in numbers that it worked differently. Maybe I'm tired and missing something more obvious, this is my first Easter event and I was not aware of how it worked.

As Scath said, the way that these Egg Sets work is that you need all 9 of a set to be able to combine them and then receive the specific Themed Pet from it and all 9 are then consumed.

The Bundle awards the Complete Set for all 3 types and when opened, they give you all 9 of each each set for you to combine to receive your 3 Themed Pets.

I apologize if that wasn't clearly indicated. In the future, you can always feel free to send me a PM about such things and I'd be happy to answer any questions as best as I can.