Different output from "swapon" versus "df -h" for swap

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Issue

Different output from swapon versus df -h for swap
When using df -h why am I getting 5.9GB when I allocated 12G to a swap partition?

tmpfs      5.9G  0   5.9G   0%  /dev/shm

I see 12G when I use free -m , /proc/swaps or swapon -s

Environment

Red Hat Enterprise Linux 5.4

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