Hi Martin,
You enemy ship isn’t really teleporting to a random position, if you watch your own video you’ll see that it is just snapping back to where it was before you tried to move it.
You don’t appear to be recording any of the movement of the ship in question, so the Timeline is just placing it back to where it should be.
On a side note, you can just upload your video directly into your post, the forum will support a file size of up to 10MB, if your video is larger than this you could consider uploading to YouTube and then embedding the video into your post.
Hope this helps
See also;
- YouTube Support : Upload Video
- Forum User Guides : How to embed a YouTube video within your post