Copy and paste does not work correctly

[Reth]

Hi there,

just tried to copy an entire deck into my cardpool. But unfortunately only 81 cards of the contained 108 cards have been copied.
If I paste it into a new empty deck or an empty card pool everything works fine.

Even exporting my cardpool as .txt, adding all the cards into this txt and loading it again does not work! There are still only 81 cards are additionally displayed while all have been added! Since all the cards are from the same set and I do not have any other cards of this set in my card pool there is no filter active and I can check results easily!
What goes wrong here?

Any help highly appreciated.

Bye