Hello,
1. The reason is original sizes of your images are too small. They should be 1425px × 1900px approximately. Try to upload images in higher resolution.
2. Please provide us with a page link where columns are shown incorrectly.
3. Unfortunately there is no such possibility. It’s Visual Composer element and we don’t modify plugins files. Try to use another element (Image Gallery, for example).
Best regards,
Jack Richardson.















