You added css after the fix i gave you which made my css invalid because of the cascade rules. But your images get cropped anyhow during the upload:
<removed> ... the edges are cut off, which means you are uploading the images in different aspect ratio then 495x400
What width/height are those images before you upload them?
Does every image have the same width/height as every other image on that page before you upload them?
*Always upload images that are proportionally larger than the size they will shrink to (495x400)
3-4 column portfolio thumbs have a constraint of 495x400 (defined in functions.php on line 69). So that means you need to either:
(a) change the width and height on line 69 so that it proportionally matches the height and width of your images before you upload them [all images must have the same width and height, so if image1 is 600w-400h that is the size all images need to be] or
(b) change the aspect ratio of images you are uploading to be proportional to 495x400.
The way to do it is to take the width of your image before you upload it, and put it in a formula:
(400 * width of your images before upload) / 495 = (height your image must be so it's proportional)
If all your images have (for example) 992 width and 723 height before you upload them, you will need to see if that aspect ratio is proportional to 495x400 using the formula above. So take the width of your image (lets say 992) and plug it into the formula
(400*992)/495 = height
height = 802
so 495x400 is proportional to 992x802, while your image is 992x723. This wont work since 723 is smaller than 802 and its easier to cut then to add 79 pixels of height to 723 to make it proportional.
So now we see what is proportional to 495x400 if we keep the height. we use the same formula
(400*proportional width)/495 = 723
proportional width = ( 723 * 495 ) / 400
proportional width = 895
The size of the initial image is 992 width x 723 height, so all you need to do is crop 992 down to 895 using graphic software while not touching the height until you are uploading 895x723 which will perfectly scale down to 495x400 without any cropping.