Not able to pick a different split shipping combination

We have split shipping. We have at least two rates available for both of the shipments but there’s no option to change rates. What causes this?

Do you mean split shipping under settings > shipping & delivery > split shipping? If yes then that is for if you have multiple locations and if one location has one item and the other has another item. both item can be shipped from different locations to fufill the customers order not split the items for shipping. If not can you provide a link to your store? that would help to see whats going on.

Thanks @prov1. interioricons.com is the store
efe test – Interior Icons is the product we’re using on a new test warehouse that has it’s own shipping profile and rate (more than one).
All other products are from a different warehouse and offer multiple methods.

For example I’ve added Cato Dining Table to the cart, I have two shipping methods available.

If I only add Efe Test to cart, I have two shipping methods available

But If I add both, I don’t get any options to chose from:

I expect this ui:

I just tested your site and yea thats weird, are you using an app for your shipping rates? or are you using your native shopify shipping rates?

For your test item, did you put in stock only at the new warehouse? because if you have it in stock in both locations and didn’t change the logic for split shipping. it pulls from the closest distance and also which location can fulfill all items first.