Fusion drive capacity issue

Hi,
the strangest thing happened to my iMac regarding the capacity of the hard drive.
In Disk Utility, the capacity is 1.12 Tb, out of which 338.64 Gb are used, leaving 781.7 Gb available. Instead, if I get info on the Macintosh HD, which is the only partition, the available capacity is 330.13 Gb and 310.45 are used. This oddity also appears in the system report, which I pasted below and highlighted in bold.
I am running Maverick OS X 10.9.4 on iMac 21.5-inch, Late 2012 (2.7 Ghz Intel Core i5, RAM 16 Gb)
Any idea about what is going on?
Davide
Macintosh HD:
  Available: 19.68 GB (19,682,623,488 bytes)
  Capacity: 330.13 GB (330,128,412,672 bytes)
  Mount Point: /
  File System: Journaled HFS+
  Writable: Yes
  Ignore Ownership: No
  BSD Name: disk2
  Volume UUID: CA529F84-5FB1-3B51-B374-000CD6226491
  Logical Volume:
  Revertible: No
  Encrypted: No
  LV UUID: AD2F1AB0-27DD-4091-8A29-54BEC4FC0280
  Logical Volume Group:
  Name: Macintosh HD
  Size: 1.12 TB (1,120,333,979,648 bytes)
  Free Space: 781.7 GB (781,698,187,264 bytes)
  LVG UUID: 935158CF-7890-40C8-8BF1-B8E689FD52FC
  Physical Volumes:
disk0s2:
  Media Name: APPLE SSD SM128E Media
  Size: 120.99 GB (120,988,852,224 bytes)
  Medium Type: SSD
  Protocol: SATA
  Internal: Yes
  Partition Map Type: GPT (GUID Partition Table)
  Status: Online
  S.M.A.R.T. Status: Verified
  PV UUID: B51EABA6-045B-4317-8B65-7C235AF4632C
disk1s2:
  Media Name: APPLE HDD HTS541010A9E662 Media
  Size: 999.35 GB (999,345,127,424 bytes)
  Medium Type: Rotational
  Protocol: SATA
  Internal: Yes
  Partition Map Type: GPT (GUID Partition Table)
  Status: Online
  S.M.A.R.T. Status: Verified
  PV UUID: 847E555B-7DFD-450B-AFC8-B5D98AFD9037

The warranty entitles you to complimentary phone support for the first 90 days of ownership.
If you bought the product in the U.S. directly from Apple (not from a reseller), you have 14 days from the date of delivery in which to exchange or return it for a refund. In other countries, the return policy may be different. If you bought from a reseller, its return policy applies.

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