You do have the correct card back, this is just a display issue.
Sorry for the confusion over this, it should be resolved, just it may take some time to display correctly for everyone.
This all falls under it being a display error, you may be able to use it but it's still just displaying the wrong information to you. Server-side, you have the correct card back, it's just not showing that to you right now.
However this should be resolved, and is just taking some time to correct for everyone.
We apologise for the confusion this has caused.