Why are my lights not working?

Hi,I just purchased Luminus LED MR16 7w bulbs and put them into my light fixture but they don\’t work properly. They are supposed to be dimmable but when I turn on the dimmer switch they only light up dimly and flicker. When I turn the switch to the highest setting and toggle back and forth the lights flash at full intensity for a split second and go back to very dim and flickering. Can you please let me know why this is happening.Sincerely,Brian