@@ -, +, @@ 
 of same key
---
 C4/Biblio.pm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/C4/Biblio.pm	
+++ a/C4/Biblio.pm	
@@ -3077,7 +3077,8 @@ sub ModBiblioMarc {
                 my $value = $subfield->[1];
                 $value =~ s/[\n\r]+/ /g;
                 $value =~ s/^\s+|\s+$|^\t+|\t+$//g;
-                $field->update( $key => $value );
+                $field->add_subfields( $key => $value ); # add subfield to the end of the subfield list
+                $field->delete_subfield( pos => 0 ); # delete the subfield at the top of the subfield list
             }
         }
     }
--