I just received a new SanDisk SDXC 1TB card to increase the space on my deck, but it’s acting really stange.

I can copy/create files/folders and even delete them, but whenever I try to format it to go from exFat to ext4 through KDE Partition manager or even the Windows formating tool I recieve a success message but the original partition and data are back again right away.

Any ideas what’s going on and how to fix it?