I've moved my page over to a different server and now the validation isn't working. It states a duplicate email address is found even when one isn't. I've followed the instructions Jason posted earlier about 30 times and I just cannot see what I'm doing wrong or why it's not working.
If I remove the validation then the details entered in the form are added to my database, if I include the validation then they are never added, even when a completely new email address is used.
I've attached a the page as a zip file - any help is very much appreciated.