Images are not showing in the container provided.

I'm under quite a bit of pressure to get these images working- the layout of the single product pages is fine but images are not showing in the container provided.
See the page here: https://thedruidsbrew.co.uk/store/products-list/bread-of-heaven/

First image of single product view with variations, is fetching an image 1*1px instead.
Conflict test (by member) did nothing.
Changing the image of default variation, or changing the default variation all together, didn't resolve the issue (tested by member)
Member had also used Regenerate Thumbs plugin, so this may have caused some issues here.

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