You can clone with
HTTPS or Subversion.
This can be worked around by removing the current image, saving, then adding the new one and saving again.
This is on the sandbox, Pod: 'Issue 839'. Single record existing with an image already selcted.
Try removing the item, adding a new, and saving. Then go to Pods Admin > Clear Pods Cache maybe?
Clear Cache has no effect, the original image remains.
Anything changing in the postmeta on save of that post ID?
Issues related to #839