Product Store Stuck in 1:1 ratio 600px

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  <img src="https://surface360.co.uk/wp-content/uploads/2018/06/cityspace-levato-mono-feature-600x600.png" width="600" height="600">
</div>

After updating my website and the woocommerce plugin, my product thumbnails are all being served as 600 x 600px.

If I go to customiser, my setting haven’t changed and they still say 3:2 ratio which should serve my product images as 750x500px.

After a lot of looking and searching, plus help from another paid third party I seem all out of luck, and cannot seem to fix this problem. It’s like its stuck at 1:1 ratio.

Here is what it currently looks like.

And here is what it should actually look like. But I cannot find a way.

Please help, many thanks

The page I need help with: [log in to see the link]