The first image is huge
2,125px × 2,772px (scaled to 421px × 550px)
The second image is also oversized
1,292px × 1,507px (scaled to 471px × 550px)
Note the width variation.
I suggest you delete them and start again by sizing the images to the exact size your want them to be offline before uploading them into your blog. Preparing and resizing your images offline there will be no loss of image quality, you will also not be wasting your space for media and you won’t experience any problems so you won’t end up troubleshooting images. http://onecoolsitebloggingtips.com/2012/03/26/cropper-or-proper-image-preparation-2/