People LUD Plugin - Images displaying incorrectly


I'm experiencing issue when trying to customise the 'People LUD' plugin.

I'm trying to change the images that display for the people, but when I do the image doesn't display. It just shows up as attached (See attachment).

When I use Inspect Element, I notice that the broken image refers to 'img src="num" but if I change it to the actual URL of the image I'm trying to import from the WordPress media library, it works first time.

Can you find a resolution to this for me?

Thanks in advance,

Lee Lewis - Universal Web Design