Occasionally, components far from 0,0,0 jitter like crazy when trying to transform (Move) them with gizmos.
The desired effect is that components move smoothly when being dragged.
This is difficult to repeat, and seems to be either map or circumstance dependent. Rebuilding the same blueprint with the exact same assets in a fresh map will clear the problem.
Just as a follow up, we tracked down the issue to being related to the root component being scaled. We already fixed it internally, it will be in the next release. Sorry for the trouble!