[تم الحل] Problem with shipping class

Background of the issue:
I have translated my website Pellvac.com to Norwegian. I've come upon a problem with shipping costs.

Symptoms:
I don't understand why some products do not get shipping costs applied to them. In Norwegian language, I only appear to have shipping costs applied to 4 products. One product that misses shipping fee is الرابط المخفي

Questions:
Can you help me understand why some products do not get shipping costs applied to them in the Norwegian translation?