If you have two widgets on a page. EG. In Sidebar and in footer, then the following occurs:
1. If you use the first (sidebar) widget then everything works as expected.
2. If you use the second (footer) widget then the input from the first widget is submitted. The show response div is also outputted on the first widget.
So it seems the signup button for a second widget triggers the first widget to submit and also uses the first widgets value/email.
Would MailUp please look into making multiple widgets work on a single page and let each widget submit their corresponding email/value.