View adds minimum crop dimensions in html tag

I have made an image style with 2 styles:
- Manual crop, with a minimum height and a minimum widith, but no constraint on the proportions.
- Scale with height and width, but no crop

When I display this image style in a view, the image tag gets width and height attributes equal to the minimum crop sizes I have entered. This means that although the image style is created perfectly with only one dimension at a minimum, the image displays as if the proportions were fixed.

Hope that explains it a bit...