I found it.
I was curious to see what the .resx files do, so I located them in the app_localresources folder. Then i went through each file doing a search for an asterisk. I found one in the first file (configuration.ascx.resx), but that was for the column title special character error message, which I don't understand why you can't use those characters. Anyway, I almost gave up, but then I got to the sharedresources.resx file and that's where I found the < value >*< /value >. I deleted the asterisk and (like magic) it disappeared from my form.
I doubled checked the form and the fields still require data before the form will be submitted, so I didn't mess up any of the required field functioning. WooHoo!
Thanks Joe. I couldn't have done it without you.
Sarah