Slider not working in Self evaluation (Redwood)

Hi

We are testing Redwood Performance at the moment and when you go into your self evaluation on your performance review page, you can click on show goal Info it flies out and there is a slider for Goal Completion which is headed up "Update your progress" but the slider underneath doesnt allow you to move it to actually update your progress.

Does anyone know if you should be able to update your progress from here or not? Just wondering if its poor wording or something thats not working properly (see orange highlighted area below)

Thanks Helen