[Koha] Problem with migrating barcodes

[clint.deckard]

I have been asked to migrate an M$ Access based library system, Karant, 
which as developed locally by a gentleman that no longer supports the 
software.
The problem is a physical barcode such as T20132X  2685 is recorded in 
the database as 120132.
I wonder if anyone can point me towards what might be happening please.
Thank you,
Clint.
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