Tell us what you are trying to do? thumbnails are set to: size='thumbnail' resize='pad' padding_color='#e6eaf2' but not all images are showing the padding.
Is there any documentation that you are following?
I checked on this for you and the issue here appears to be that your images are different dimensions. If you check here below. hidden link
hidden link
You will notice that they are both different dimensions hence why some of the images will have the paddings and some won't because they would've already been cropped to their thumbnail sizes.
Please let me know if this clears this up for you.
but only some of the ones that should have padding do have it. the square images would not need it, but most of the ones that aren't square don't have padding (or at least I can't see the background color to indicate there's padding.)