Lost promo unlocks for Sepuchral Strength

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Hello everyone

i've already posted this in the 'Data Loss' Thread which seems a bit deserted though.

I'm playing on the iPad and have entered the 10 promo codes. A few weeks ago I noticed that my ten promo unlocks had vanished. But not from every deck, only from the Sepuchral Strength deck. After that I played an online duel and it told me that I have unlocked a new card. But when I go to my deckmanager it tells me that I have 31 unlocked cards and there are still 9 cards locked which are invisible though.

Does anyone know this issue or does even have a solution? Help would be appreciated.