strange problem with gparted.

[Joep L. Blom]

I have a strange problem with gparted.
fdisk tells me:
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xb419b419

    Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        6374    51199123+  83  Linux
/dev/sda2            6375      121601   925560877+   5  Extended
/dev/sda5            6375       32224   207640093+  83  Linux
/dev/sda6           32225       33244     8193150   82  Linux swap / Solaris
/dev/sda7           33245       46299   104864256   83  Linux

Well this looks normal.
However gparted tells me:
/dev/sda (931,52 GiB)
Partition	File system 	Size
Unallocated	unallocated	931,5

I don't understand that. Is that a bug in gparted?
OS Ubuntu Lucid
Linux Laguna-new 2.6.32-26-generic #48-Ubuntu SMP Wed Nov 24 10:14:11 
UTC 2010 x86_64 GNU/Linux.
Somebody has a clue?
Joep