Question regarding the otuput from check_disk

Hi,

I have a little question regarding the output from the check_disk plugin.

On one of my servers when I execute check_disk I get the following result:

>> /usr/local/nagios/libexec/check_disk -w 7% -c 5% -p /var/storage
<< DISK CRITICAL - free space: /var/storage 602801 MB (3% inode=96%);| /var/storage=15617429MB;15882113;16223663;0;17077541

The check returns a critial, but when you look at the performance data (/var/storage=15617429MB;15882113;16223663;0;17077541),
the disk usage is below the warning threshold.

How come the check return value and the performance data doesn't line up?

/Karsten

P.S: Thanks for some great plugins :)