Insert Business Rule problem version 8.6.11

I have a master/child record with an insert business rule to insert data into another table based of the detail.

If I import say 10 records it imports the records and inserts the 10 records into the business rule table. I have a another business rule to delete the data if the record is deleted and works accordingly.

But if I want to reimport on the same order it doubles the records for the insert business rule so I have 20 records instead of the ten even though I have deleted the records on the detail.

Is this a bug and how do I troubleshoot?
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