Some thumbnails only half-loaded?

Loving the hatch theme, but having one weird issue: some of my thumbnails aren’t loading properly and are displaying as about half the normal size.

You can see the issue here: http://blog.volkstricken.com/?paged=2 where the first row of images is full size, but the other two rows are cropped strangely. Other posts both before and after these ones are fine.

Anyone else ever had this problem or have any ideas?

http://ww.wp.xz.cn/extend/themes/hatch/