Two possibilities come to mind;
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You have modified your form’s body template under your site’s form notification settings, and you are not including the data macro. Check that page for instructions.
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You have a script running on the page which is acting on form submit, and deleting that data just before the Webflow.js submit handler picks up the data.
Check your form submission history on your site settings form tab at the bottom, if you see data, then you’re getting it, and #1 is likely the problem. If you’re seeing submissions but the data is missing, then #2 is probably it.