I don't know where Ben is but I can answer that real quick. I looked at the source code of your form. All of your checkboxes have the same "name=agencias". Checkboxes are different than radio fields and need to have a different name for each one (at least in your case). Ex: Porto could have the name="porto", SJM could have the name="sjm" and so forth. Each name must be unique to each checkbox. You will need to set up fields in your database for each name that you create for each checkbox on your form.
The radio fields are fine because they're grouped where the output is based on a single choice from that group.
The radio fields are fine because they're grouped where the output is based on a single choice from that group.