Europa Stamps on Postcards.

Last week I received two postcards with the same Europa stamp (RU-468 and RU-545). It quite surprised me. Is it an error?

Hi! I have removed the duplicate.

Hi,
This stamp Russia Musical instruments 2014 is duplicated in the catalog with different names 'Musical instruments' and 'Musical instrument'.
May be it's possible to remove the duplicate from catalog?

Hi. I have the same issue: RU - 1207 sent 04.09.21, registered 23.09.21 and RU - 1215 sent 08.09.21, registered 28.09.21. As you can see they are both registered, not expired. Hope it doesn't happen again.

What happened is that the first postcard expired and this made possible the second postcard.
RU-468 sent on 18 June 2020
RU-545 sent on 18 August 2020
If you have a postcard traveling (60 days on this club) or registered, you don't receive another one. But if the postcard has expired, it is considered lost, and therefore you get again the chance to receive that item.