Regerated to wrong size

In Jigoshop I’ve defined that all my large images should be 213 x 300. And the images I upload are always this size. But when I regenerate images (because I had redefined the size of smaller images) the large images are suddenly cropped to 213 x 143. Where would the plugin get this info? I can’t find it anywhere …

http://wordpress.org/extend/plugins/regenerate-thumbnails/