[Koha] Duplicate 300f (Physical Description) field

[T & J Kotula]

Hi,

I have noticed that for some biblio items I get a duplicate "Physical 
Description" field. When I view it (/cgi-bin/koha/MARCdetail.pl?bib=xyz) 
prior to editing it, it shows correctly only one 300f field. However 
once I click on "Edit biblio" I get a duplicate "Physical Description" 
field. If I then "Save Bibliographic Record and go to Items" and view it 
again (MARCdetail.pl?bib=xyz) I see now two 300f fields. If I then click 
on "Edit biblio' I get three 300f fields.... They just seem to grow.

I have also noticed a similar behaviour with 245a and 245c fields (again 
only on some biblios). They also seem to duplicate when I click on "Edit 
biblio", however the additional one does not get saved with "Save 
Bibliographic Record and go to Items".

Would anyone know if this is caused by a corrupt database or a subtle 
koha bug?
What can I do to fix it or diagnose it further.

I'm running koha2.2.6 on FC4. MARC check does not report any errors.

Many thanks

tomasz kotula.