Hi Well, that is an interesting error. Objects shouldn't be moving after being placed from their editor versioning provided that you aren't adjusting their position via snapping or through the entry state actions. What objects are you adding that are behaving this way?
For adding states, I'm only able to replicate your issue by not left clicking in the Scenario Flow Canvas after adding the state. I am able to left click the "+ State" button, then left click anywhere on the Canvas to drop the state. Also, right clicking, selecting "Add State" then left clicking to drop it works for me as well. If I right click the state will not be dropped and will instead delete it similar to what I am seeing in your video. If you are doing the above and are getting the same result can you let me know?