Images within Shop

Hello.

My client is having issues with the images used for her shop products as being blurry, both the thumbnails for the images when loading the cart page, and the actual images when you click to view a single product.

https://www.winestains.com.au/shop/

and (for example) https://www.winestains.com.au/product/circular-cheese-board/

They are clear on my screen, but she has sent me screen shots of what she see;s, and they definitely are blurry on her screen no matter the layout we choose (Modern, Tab Items | Image etc.)

Here is a screen shot of what the client sees:

and what I see

Any advise would be greatly appreciated.

Regards

Manamedia