Scheduled export was configured to export data from the database view and it was set to only export the deltas of the view but it is exporting the entire view.
Due to PRB1376319
Delta Export functionality is not a supported feature for tables which are of the type database views in the platform. Any table other than database views is supported by the Delta Export functionality in Scheduled Exports.
If customer seek this functionality OOB, they can open a enhancement request for it.