Products not refreshing when category selected

Hi.
I’m running WordPress with a DIVI theme. I’ve installed Woocommerce successfully (I think!) and the Woocommerce Product Filter plugin. I’ve added the filter to a widget in my sidbar.
When I select a category to filter on, the page reloads, but all of the products are still displayed, not just the ones with the category I selected. Have I set something ujp incorrectly?
Thanks,
Kerri

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