Hi, it looks like a form code issue.
You can try to modify or generate a different code. For example, you can use the Gwa Form Builder (https://formbuilder.freeautoresponder.biz/).
Just create a new form there, then copy & paste the new code into your GWA plugin.
Or, maybe there’s some conflict between ARGWA and your wordpress theme.
Try it with some other theme.
You can also check this out : https://www.heelshield.com/wp-content/plugins/autoresponder-gwa/GWA-FAQ.pdf
Anyway, you should find that FAQ inside the plugin folder.
I hope this will help you.
Andy