Truly wonderful to be wrong. In my own defense it's not easy, sometimes,to be accurate looking at a picture. :wee :wee :wee :wee :wee :wee :wee :wee :wee :wee :wee :wee :wee
Hope for the best then as I can't explain the movement you see without seeing it myself. I hope I am wrong in my assessment. Good luck and please post if the egg hatches. When eggs go DIS and decompose sometimes they seem to move. Again, I do hope I'm wrong and please post it if I am.
The egg has died; discard it. Such eggs, left in the incubator are likely to explode as gasses build up inside. But since you have locked down you might want to leave it until the hatch is complete.