COMBINED SHIPPING ISSUE
So Shopify has started to combine shipping for different sized items.
For example, an order with both an A3 & A2 print will add both shipping costs together as these are both pulled from different shipping profiles.
Because of this, shipping costs at checkout for some customers are extremely high.
Unfortunately there's no way to change the shipping settings within Shopify to stop this from happening. Therefore, please continue to place your order and I will flag that you have paid too much shipping and issue you a partial refund on your shipping.
Thank you for your understanding and happy shopping!