Ultra 16GB reads at only 2.14MB

The Ultra CompactFlash 16GB card only reads to a capacity of 2.14MB in both my Canon PowerShot S30 camera and SanDisk ImageMate 12in1 card reader ( Model # SDDR-89 VV3 ).
How do I retrieve the full capacity of this card? I am using an iMac with macOS Catalina.