url in CSS resolves to a relative path

Various Ensemble8 samples have CSS entries that use "url" to point to images. For example:

-fx-background-image: url("/ensemble/samples/shared-resources/Curve-fitted-background.png");

We were expecting the above url to start from the root when looking for the above file (i.e. we expected the file really to be at /ensemble/samples/shared-resources/Curve-fitted-background.png). But it looks like the url resolves to a path relative to a different root. It looks like the above ends up looking for a file at: /ensemble/samples/charts/area/curvefitted/ensemble/samples/shared-resources/Curve-fitted-background.png instead of just /ensemble/samples/shared-resources/Curve-fitted-background.png.

I think the first part of the former path (the long path) is the location of the CSS file that has the url entry.

Is it supposed to be this way?