To troubleshoot an incorrect number of responses in Microsoft Forms, please follow these steps:

1. Ensure that the form is configured to require respondents to sign in before accessing the form and before submitting a response.
   
2. Check the Responses page of the form to see if any responses are out-of-sync due to network issues or user cancellation after they accessed the form. If this happens, click the Sync button in the responses section of the form.
   
3. Check the form settings to ensure that no restrictions have been placed on the form for a limited number of responses or a specific response date.
   
4. Check for any duplicate responses by reviewing the timestamp of responses.
   
5. Review the settings in the Responses section of the form to ensure that the Automatically delete responses option is unchecked.