In Dreamweaver you can see all the validation that you applied to this form by going to (Window -> Behaviors), then select the form tag in Design View. The Behaviors panel will show you the type of validation you have applied to the form, and when i did a quick test, i see that you have applied validation to the company_name field. But you can easily add and remove by clicking the +/- button.
let me know if you have any other questions.