Lost price from Google Search results for specific product

When I search for my product on Google, I used to see the price listed in the results page.

Search for “kiddikutter nz”

My site is the second result (https://kidsinthekitchen.nz/product/kiddikutter-knife/) and used to show the price, just like the first result (who are more expensive!). Now, the price doesn’t show up for this product.

Other products show up with prices. Search for “sinchies nz” and that shows a price fine.

I’ve used the Google Structured Data Testing tool, it looks fine.

Any ideas how to fix? My knife sales have dropped significantly.

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