Package weight not filtering to click and drop

[Pommad]

Hi

My products are filtering to click and drop but I have a problem where it is not adding the box rate to the postage weight so we have to manually change the entries. Is there anything I can do so the correct weight pulls through to royal mail please? Shopify is calculating correctly but only the product weights are pulling through so if we just printed the labels it would be underweight

Thanks 🙂