Lookup field doesn't update the value

Lookup field doesn't update the value

Hello Team, 

After that migration of Lookup Field there are few records in which the Lookup field value doesn't seems to be update. 

Application: Penta CRM 11
Form: TO DO Form

Record url:
http://creator.zoho.com/piju2111/penta-crm-11/To_Do_Form/record-edit/All_Records_of_TO_DO_Form/190193000006486043/

When you open the above url it show the CallStatus feild as "Scheduled" rather we tried twice choosing "Closed" and submit the form. 

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