one speaker displayed in oval rather than circle

http://sustainablerubber.org/conference-2016/#speakers

First speaker's profile pic is an oval, not a circle.

Hi,

It's because of your featured image file:
http://sustainablerubber.org/conference ... st-center/

The original image file size is 130 x 180px, please use a square image with the same width and height and should be fine.

yes I did now. But strange, other images were also in that ratio when uploaded, but somehow were cropped by Wordpress where that one was not.