Auto select Weight Shipping

Cant seem to get Weight shipping to auto add shipping cost

I only have weight shipping enabled and am trying to auto select it
running through the code it appears to think there are multiple shipping methods, is there any hook or setting to hardcode weightrate into the page.

Ive called updateShipping(“WeightRate”,”weight rate”)

if the page but the shopping cart page requires a refresh to display the shipping cost total?

Any ideas would be a great help

Thanks

https://www.ads-software.com/plugins/wp-e-commerce/