Weird System Status Issue

Under Disks:

Disks
/ 167%

It says 167% is in use for this specific disk meanwhile other graphs show otherwise,

Tried rebooting

Anyone know why this is happening?
freepbx 2.5
thanks

What does df show?

Filesystem 1K-blocks Used Available Use% Mounted on /dev/sdb1 1418841312 1906048 1343699752 1% / /dev/sda1 101086 16362 79505 18% /boot tmpfs 2073620 0 2073620 0% /dev/shm

Here is the FreePBX page:

Could you please try this patch:

Index: page.index.php
===================================================================
--- page.index.php      (revision 7297)
+++ page.index.php      (working copy)
@@ -201,7 +201,7 @@

        $out .= "<h4>"._("Disks")."</h4>";
        foreach ($sysinfo->filesystems() as $fs) {
-               $out .= draw_graph($fs["mount"], "GB", number_format($fs["used"]/1024/1024, 2), number_format($fs["size"]/1024/1024,2), strpos( $fs["options"],"ro" )!==false ? array(0=>"graphok"):null);
+               $out .= draw_graph($fs["mount"], "GB", number_format($fs["used"]/1024/1024, 2,".",""), number_format($fs["size"]/1024/1024,2,".",""), strpos( $fs["options"],"ro" )!==false ? array(0=>"graphok"):null);
        }

        $out .= "<h4>"._("Networks")."</h4>";