bug on resize image

Hi !
I have some issues when i want resize an image.
When i put an image and when i click one resizer handler, the image don't keep his height but expand it to 100% of parent container...
I didn't found an option into the "resizable" option to disable that :
`editor.DomComponents.addType('image', {
    model: {
        defaults: {
            resizable: {
                step: 0.05,
                minDim:1,
                maxDim:100,
                unitHeight: '%',
                unitWidth: '%',
                currentUnit:0,
            }
        }
    }
});`

For context, the image has a absolute position.
Thanks for help !