My louvers only have these tabs that go around the hatch. I drove with them for a mile and couldn't stand them hopping up and down on my car. I have pictures below. Is there something I am missing? Is there something that is supposed to go around the hatch and hold it on from all three sides? There are these 4 tabs on the inside of the plastic sides (two on each side0 but I don't know what they are for.

Thanks