Why is this project rule running on EVERY task despite having "Check If" set?

Hi! @Matt5

Could you try this post(How to link the due date of a specific task into a custom field of a portfolio - #17 by Tetsuo_Kawakami).
function today() results your problem.
today() runs everyday, so task history is added every day.

@Phil_Seeman
Thanks for your exlpaination.

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