Why my partitions don't show the right capacity on a 4096 byte physical block hard drive?

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http://unix.stackexchange.com – After reading a lot about why newer 4096 byte physical block hard drives should be partitioned taking care of alignment (Linux on 4KB-sector disks: Practical advice, What is partition alignment and why whould I need it?, Why do I have to “align” the partitions on my new Western Digital hard drive?, I was convinced to make sure my new disk was properly partitioned and formatted with 4096 byte blocks. So I did partition it using fdisk -b 4096 /dev/sdb and specified a 50GB size for sdb1, 412GB for sdb2 and the remaining space to sdb3 (3.8GB for sdb3), leading to the following partition table (HowTos)