Hmmm, look at the labels. They each say something something "100".

Not the right language, but maybe something like per 100? Like per 100 grams of water? Or.. something about volume?

IDK, it would be a weird way to do it. But something like that might explain why so much sugar, seemingly more than can fit in the can.

Sugar is heavy, there's no way 39 grams is the same size as the can

Edit: gandalf seems to have the right idea here! https://sh.itjust.works/comment/24686999

Edit2: wait, a can has 300+ grams of fluid in it... So the sugar would be 1/3 of what the whole can would be. This actually makes the picture more confusing 🤔

Edit 3:

Behold, 39 grams of sugar. About one shot glass worth.

Here's that glass next to a can. I don't have any soda pop in the house.