Splinterlands miracle - cards disapearing

Something strange happened at my Steem Monsters account. All the cards I have owned misteiously disappeared. Is that some kind of error at the game, or someone just stolen my cards, or they simply became invisible?

The power based on the strenght of my cards is same as before the miracle happened.

And all the potions I have won as quest and season rewards are on the place.

Well... Big question mark is upon my head.