Some images not being allocated to shares

Hi guys,

Ive noticed a couple of times now that images on shares have not been coming through to the stream.

For example http://www.wheeconomics.com/mywhee/stream/item/796

This hasn't been happening at all before and when the same links are shared on Facebook for example the images are pulled and displayed just fine.

Could you advise on the best way to troubleshoot this please?

thanks,

Paula