Have you tried recreating the form on a test page so that you have just the bare form.
Leaving out all the table formatting code especially the style coding in the input lines for name1 and email1. Then test that and see if that works okay. If it does not you can try filling in some of the blank values (create just one URL page if necessary). I know they are not required and can be left blank but at least you will be able to eliminate the lines one by one.
If it works you can start adding your table code back in bit by bit until you have completed the page which you can then move over to your production page.
(Note I added that extra line which you could first try leaving in and then removing.)
It may just be that the list.cgi program gets updated slightly without the instructions reflecting it.
Opinions are my own views, not DreamHosts'.
I am NOT a DreamHost employee OK!! :@
You act on my advice at your own risk!