Woocommerce applying random flat shipping rate

Hi,

Our flat shipping rate is set to 63kr within Norway. It has just been flagged to me that when when you try to check out with an item on our website at the moment, a flat shipping rate of 727kr is applied at checkout. This applies to all our products, and it occurs across multiple browsers and devices. I’ve checked the back end of WooCommerce and everything appears to be set up as it should. I’m totally stumped.

Help is very much appreciated as this is generating multiple complaints, not to mention lost revenue.

Thanks

Steph

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

 

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