storage size display error

" Hello,
we used V7 lite open-e software. the mounted file from the opne-e v7 storage has a wrong file size display in kilobyte when mounted in a linux machine.

# du -sb abmd01.dbf
52436992 abmd01.dbf
# du -sk abmd01.dbf
65536 abmd01.dbf

52436992/1024.0 = 51208, the correct kilobyte size is 51208 not 65536. I copied the same file into a v6 lite open-e storage, the size for kilobyte display is correct.

# du -sb abmd01.dbf
52436992 abmd01.dbf
# du -sk abmd01.dbf
51208 abmd01.dbf


Any idea why the file size is wrong when displaying in kilobyte in linux for open-e v7 storage server?
Thanks

-W