Create new row on new row creation

I have two tables:

Items
Tasks

I am trying to setup an automation as follows:

On new row in Items table,
Create new row in Tasks table labelled “Purchase Item.Name”

This seems to work, but for some reason creates duplicate entries in the Tasks table.

Dear @oscarmorrison,

Welcome :handshake:
:bulb:
I recommend to share a dummy doc, to make it more easy to understand the logic and if necessary to play around to find a solution.