I meant when I add (the green plus sign)
When you use the green plus sign, you add from scratch, as the tooltip that appears explains to you.
If you really own the video #030306770093, you should select it from the existing videos, and click the button "add as own". This way, all the fields will be set according to this existing video.
If the video you own is missing from our list of existing videos, then you'll add from scratch. When you add from scratch, the media type and language will be set to the last values you've used, and a barcode will be associated, for the video to have a picture instead of none, but it's almost random (if you last added an english DVD, it'll try to pick up the barcode of an english DVD). You can easily change the barcode field to select a different picture.