ScroOh I see your point! But you know that shipping at Massdrop is variable, depending on the destination, and they have several shipping partners (for different purposes).
So I think sometimes they could not possibly list every shipping cost combination possible, that's why it's presented to you at checkout. Other times, I see shipping costs presented upfront, I guess it's because it's more standard for some products?
It's a very variable situation I've seen.