Hi pior, in the video it looks like you need to edit an image "corner to corner" but you are in "scale from center" editing mode.
To edit an image corner to corner like when you initially create it you'll want to be in "scale from opposite corner" grip editing mode, not "scale from center".
You can switch the corner grip scaling mode by clicking (press and release the mouse button) on a corner grip instead of dragging on it. It looks like you may be doing this accidentally and inadvertently switching the mode.
You can tell what mode you're in by observing where the center mark appears while your mouse is hovered over a corner editing grip.
Currently background images are designed to maintain their aspect ratio when sized. If you want to change the aspect ratio you'll need to modify the image in an image editing program and then bring in the new image instead.
- Michael
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