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Multi-step form with Iframe

Hey everyone!
i designed a multi-step form which in the “success message” I put an Iframe.
the problem is in the last step of the form - when submitting, somthing goes wrong.
it used to work when i tried it at first time… this is very frustrating

video of the bug:

Preview link webflow :

live site:
screen shot from inspect:


JanneWassberg any help?

someone ?