Incremental | Append mode is not working correctly for source connector OracleDB

Connection: OracleDB > Redshift

Settings

Source Data

Ran multiple syncs without making any changes in the source data, therefore incremental mode should not append any new row in destination.
But it appends the same data again and again.

But your cursor field is not the correct type: https://docs.airbyte.com/understanding-airbyte/connections/incremental-append#source-defined-cursor