Hello,
This is supposed to work: when you add a second tax rate to a product line in an order, both rates should apply to the line and be included in the order total, so what you are seeing is a bug.
The cause is the comma in the tax rate name "Recargo Equivalencia 5,2%". When the order is saved, HikaShop stores the list of tax rates assigned to the product as a comma separated text, and the comma inside that name splits it, so the rate is lost and only the IVA is kept.
We have fixed it for the next version. You can already download the install package of HikaShop on our website and install it on yours in order to get the patch ahead of the release. It will then work properly.