Worknotes getting update twice

Hi All,

I have requirement to set work notes of related list entry numbers when record is inserted. I created before insert business rule which is working fine sets value of count and worknotes. But when I made first update to record worknotes comes twice and after first update if I made any update work notes comes one time as usual worknotes comes. Please help to resolve this issue why worknotes comes twice when first update is made to record.

Attached is screenshot of issue.

Regards,

Tara Singh