Unwanted second notification email is sent with subject 'str str'

Unwanted second notification email is sent with subject 'str str'

HI

When a use fills in my form, it then sends out an automated notification email.  That is fine.  It then sends out a second notification email with the subject line 'str str' and the content seems to be a very old version (when I was testing it out).  

Does anyone have any ideas?  I have tried creating new rules but this doesn't resolve it.

Hope you can help

Steve