Shipping costs not calculated correctly

-- url of the page with the problem -- : shop.hansplanje.nl
-- HikaShop version -- : 5.0.4
-- Joomla version -- : 4.4.4
-- PHP version -- : 8.1
-- Browser(s) name and version -- : firefox latest

As a customer to this webshop, you can order from several categories.
If you order one item only from category A, the cost for shipment is €7,50
If you order one item only from category B, the cost for shipment is €5,00
If you order one item from category A AND one item from category B the cost for shipment is €7,50
If the total amount of your order is above €250,- there shuld be no cost for shipment.

The calculation for shipment above €250,- works correct. There is no additional fee.
How do I achive the other options correct in HikaShop?

I have finally found the cause of the problem.

I used a manual shipping method for taking goods from the shop.
In this case there are no shipping costs.

What method or plugin can I use for goods that are collected from the store?
So there are no shipping costs charged whatever the price is.