When creating a new context and choosing to sort on a Ranking field, the Ascending and Descending options have no effect.

As per the description:

If you create a new context and try to order the ranking field in desceding order, it has no effect.

1. Add a ranking field to a project
2. Create a new context
3. Specify sort on Ranking field and select the DESC option
4. The results are always shown in ascending order