Exported forms will not work on different hosting. Check > https://university.webflow.com/article/collecting-form-submissions-on-exported-sites
You will need to manually make them work. One option is to use service like https://formspree.io/
You go to the Webflow designer > click on the form > go to the settings panel > add the formspree URL
Here’s how it looks > https://www.useloom.com/share/11d09c063403449cae8eee0605d96951
They have a free plan with some limitations > Formspree is free for 50 submissions per form per month
Other options are doing some server side coding in order to get the form working. I’m not a code master so I can’t give you directions.
Hope this helps