Hi,
We use this tool in our company and recently we create survey for employee satisfaction. Survey has about 50 question and 3 pages. Sometimes some of employee escalate that after they fill up all form field on 3th page and click on Submit button survey redirect employee to first page instead to thanks page and display error that they did not field up every field.
we don't know why this is happening.
just to add, regularly if some field did not finished we get error when try to go to second page. In our case, employees don't have any error until they click on the submit button on the last page.