Okay it seems, there COULD be a bug...Its something with the image itself... But it looks fine when on full image, so I think it has something to do with the cache/thumbnail code maybe?
I exported in Adobe Lightroom, maybe that has something to do with it?
Edit: I used FTP and I uploaded a diff image and it works fine for that smaller image (i deleted it tho; it was not exported through adobe lightroom)