The refinementList widget is designed so that it won't show any facet values that do not have any matches, to prevent the situation where your user selects a filter where there are no results.
If you do want to show all facets you can use the guide "Display Facets With No Matches"[1]
You can also define the facet values manually "Add Manual Values"[2]
The alternative option would be to use a conjunctive facet such as the Hierarchical Menu[3] or the Menu Widget[4] which will allow your users to select any facet value and ensures that results are being returned by changing the facet value to match the new selection.
Links
[1]: Display Facets With No Matches
[2]: Add Manual Values
[3]: Hierarchical Menu
[4]: Menu Widget