On the advice on an NREL developer I tried to do the same thing but in a pure Linux environment (I used the Windows Subsystem for Linux in this case)

The issue doesn't appear to occur in my Linux install so it appears this may be a bug with the Windows version of the GMT. I also shared this with the developer who made the suggestion.GMT

On the advice on an NREL developer I tried to do the same thing but in a pure Linux environment (I used (Imused the Windows Subsystem for Linux in this case)

The issue doesn't appear to occur in my Linux install so it appears this may be a bug with the Windows version of the GMT