angry pasta

I just installed my new LOD rear bumper and was taking it out for a test drive to check for any rattling of the new bumper. Every thing was fine initially then I noticed a something was squeaking in the back. I narrowed it down to the rear glass hatch on the hard top, it only makes this noise on rougher pavement. Does anyone else have this problem I'm not sure weather i should tighten the stoppers on the door that contact the tire carrier or loosen them. I have tried both and had the same result. Everything on the bumper is solid and locked down pretty tight and level.

If anyone has an idea let me know.