Thumbnails Not Cropping
Sunshine has an option which allows you to crop image thumbnails to a set size. This helps all the thumbnails have the same size. However, if you are noticing that your thumbnails are not cropped, please note that when enabled this feature does not affect already uploaded images. So if you uploaded images to galleries, then enabled the crop feature you are likely not seeing cropped thumbnails.
To update already uploaded images, use a 3rd party plugin like Regenerate Thumbnails which will recreate thumbnails for all images uploaded to your site (including Sunshine galleries).