The form is on the home page, so I'm thinking the scenario would be the user returns there either by hitting home on the nav or with their back button. There will be a redundant form of navigation, but I'm trying to cover all the bases.
Right now, when I test this, when I go back to the home page, the form says "We’re sorry. It looks like you’ve already submitted that."
You should use this to diagnose the "We're sorry" issue - https://formidableforms.com/knowledgebase/publish-a-form/#kb-it-looks-like-youve-already-submitted-that
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