I took a closer look 
and I did the following:
I loaded the screenshot from your Inkscape graphics into Gimp and checked the color of the brown rounded rectangle. The color Gimp gave me was #8c7b58.
Then I checked your screenshot from VCV in the same way and the color was #987952.
Because an SVG file is a text file, I searched your SVG file for both color numbers, and I only found #987952 seven times n the file (there are 7 elements with that particular color in your SVG).
So IMO VCV displays the SVG correctly and Inkscape does not.
Addendum: My Inkscape Version 0.92, running on Windows 10, displays colors correctly.
What’s your OS? What’s your Inkscape version?