The hdr and img have different names (dates), probably because your stack contains multiple slaves.
It is now hard to tell the actual date of the unwrapped phase.
For a quick solution, rename the img so it matches the hdr file and start the import again.
If you want to unwrap more images it is advisable to create separate products with one master and one slave and unwrap them separately. snaphu cannot process stacks with more than one phase image.