When I click On, Fast On, Off, or Fast Off in the scene, the relay does not change state but the status at the top of the scene, 'Current State' changes (On or Off following the correct click)
I added a KPL button as a controller and it acts the same; press the button, the 'Current State' changes but the relay does not energize/de-energize.
I did confirm again, if I adjust the slider to any position other than 0 to 100 the dialog box comes up saying that level is not supported what do you want to do. If you adjust the slider to 100% the relay energizes, if you slide it to 0% it de-energizes.