unable to import without duplicate contact

unable to import without duplicate contact

Hi

I try to change the "Network" field for these two existing contacts in Zoho, using the attached Excel file that I import in "Replace" mode.
 
Each time the two contacts are duplicated!!!

can you help me ?
.

EXCEL FILE : 
Nom Prénom Network
DELEMARRE Albert APM;Concert
DESSANE Alexandre Concert


Didier