Trouble with encrypted SD card
You’ll need to step through the process manually using Disk Utility.

First connect the card and then don’t enter anything. Next open Disk Utility and then see if the entire disk is encrypted and how many volumes exist. You can also get this data from the command line:

diskutil list


Or the information tab in Disk Utility and perhaps the menu item to show all partitions. It’s possible you erased everything but it’s also possible that you just renamed the volume inside the encryption. It’s hard to guess without specifics and some back/forth between you and someone that knows disk partitioning.