The starting place for forms troubleshooting is the guide below:
Would you please perform the checks in that guide? If you have read the guide and it does not fix the issue, would you please provide the details requested in that guide, as quoted below:
The URL for your live form as you want visitors to use it
The URL of your deployed html form. In case you have a javascript form, we need to literally be linked to the html version you’ve deployed, as mentioned above (look for “pure javascript form”)
The form name that you’ve set and that shows in our UI (if it shows in the UI)
Any errors or logs from the Netlify build logs, dashboard or browser developer console
Description of anything you have tried that did or didn’t help or make things better/worse
If you would please send us those details above, we will take a look and let you know what we find.