I've used that same dimmer with a dimmable LED fixture (similar to this one:
Hampton Bay | 3 Light Semi-Flushmount Track Bar Fixture Matte White Finish Etched Glass Shades | Home Depot Canada), it all works fine together.
My first thought would be that you might have wired something wrong - some dimmers, especially LED/CFL compatible ones, it DOES matter which lead is source and which goes to the light.