Hitch mounted bike rack swaying Should hitch mounted bike racks move or sway when traveling?

My current one (1.25", two bike trays with arms clamping on the tire) will sway and move when traveling with bikes on it.

During the weekend, I had a discussion about racks where the other person stated his didn't sway during traveling.

Update

I had a closer look at my setup last night. The swaying comes from the hinge between the rack and the receiver tube. There is a bit of play there enabling the rack to move and sway.

The rack has a feature of being able to angle it away from the car in order to get access to the hatch, or to store it closer to the tail gate when not in use.
Manufacturers recommend a strap to stabilize a (class 1) hitch-mounted bike rack so it doesn't bounce or sway.  For example see Stabilizing Strap for Hitch-Mounted Accessories, and especially the review video lower on the page.

(This is not a product recommendation, just the first thing that popped up in a search.)