Primary Key Violation at the time of Moving from primary range to secondary range.

Hi Experts,

I've observed a strange issue in our environment.
we are using sql server 2008 R2 with SP2.

whenever a table is moving from primary range to secondary range on it's identity values, application is getting crashed with the message as below. 

Violation of PRIMARY KEY constraint 'PK6'. Cannot insert duplicate key in object 'dbo.TD_TRANN'. The duplicate key value is (17868679).
The statement has been terminated.

OR

Violation of UNIQUE KEY constraint 'IX_TDS_COST'. Cannot insert duplicate key in object 'dbo.TDS_COST'. The duplicate key value is (17, 19431201).

identity ranges were auto managed by replication. agents are running continuous.

please suggest.

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Cheers, Vinod Mallolu