Hi, the containers aren't divided into 1/6's this was just a UI tool that helped, but clearly it needs to be improved. We went with the blocks as a way to avoid overwhelming users with percentages - perhaps we can try to add hinting to help.
Here's how they are really sizing:
1 block selected = 25% (1/4)
2 blocks selected = 33% (1/3)
3 blocks selected = 50% (1/2)
4 blocks selected = 66% (2/3)
5 blocks selected = 75% (3/4)
6 blocks selected = 100%
So, your combinations of 1 block, 3 blocks, and 2 blocks is actually 25%+50%+33%.
