ADF - Calibration problem

[Helaury]

Hello,

I have started using sane to scan using an ADF.

$ scanimage -V

scanimage (sane-backends) 1.0.22; backend version 1.0.22

$ scanimage -L

device `hp5590:libusb:036:003' is a HP 4500C/5550C Workgroup scanner

$ scanimage --batch --format=tiff --mode Gray --resolution 75 --source ADF --batch-increment 2

Here's the output for the first 3 pages: http://tinyurl.com/b3shh4v

The problem is that a portion of the left hand side shows on the rhs and conversely. This portion grows with the number of scanned pages. 

Any advice on fixing this calibration problem?

Platform: OS X 10.6+ - MacPorts 2.1.3 

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[Helaury]

Also,

$ sane-find-scanner
found USB scanner (vendor=0x03f0 [Hewlett-Packard], product=0x1205 [hp scanjet scanner], chip=HP4500C/4570C/5500C/5550C/5590/7650) at libusb:036:003