cygwin cygdrive paths and Windows Command Prompt

I'm having a weird issue with cygwin acting inconsistently between installations, specifically scp. I have c:\cygwin\bin in my Windows PATH in both cases. When I run the following command from a Windows Command Prompt, however, I get very different results between the two installations:

scp /cygdrive/c/something.txt User@server:${HOME}/something.txt

On the one machine it transfers the file just fine, but on the other machine I get an error:

/cygdrive/c/something.txt: No such file or directory

However, if I execute the command this way on the machine that gave me the error, it transfers just fine:

scp /c/something.txt User@server:${HOME}/something.txt

Why the differences? Is there something I need to configure within cygwin to make this work with /cygdrive/c?

UPDATE: Here's something more interesting. If I do ls /c from a Windows command prompt I get what you would expect, as list of everything in C:. However, ls /cygdrive/c says that it doesn't exist. Running those commands from the cygwin bash yields exactly the opposite behavior.

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