Timewarping expenses claims?

From April 2007 to December 2007, Tom Watson MP made the following claims under the ACA for mortgage interest/rent.

Submitted: 18/04/2007

Submitted: 03/07/2007

Submitted 07/08/2007

Submitted: 4/10/2007

Submitted: 10/12/2007
So, this covers 9 months, from April 2007 to December 2007, at a consistent monthly cost of £805.78. Then the following ACA claim was made (red box added by me).

Submitted: 29/04/2008
That figure isn't a multiple of £805.78, so doesn't that look like a claim for mortgage/rent for the entire year during which claims for mortgage/rent had already been submitted and received?