Why Do UFO Discs Wobble?

This wobble effect has not been associated with other reported Unidentified Anomalous Phenomena (UAP) shapes, including triangles, spheres, and Tic Tacs.

What could cause this movement and why is it only displayed with discs, assuming other shapes also use similar methods of propulsion?

A common assumption is that the anomalous propulsion system that powers these vehicles can manipulate gravity, which means it can manipulate spacetime.

Such a system could be powered by negative matter, as I described in Can Tic Tacs Fly?