Yes, you are correct - I have any form post selected.
I got tis from the docs;
"Any Form Post: Any form posted to the page that the server behavior is applied to will trigger validation. This is typically used when a form on a different page is submitted to the page for validation."
I tired all of the other choices in the drop drop down and got the same results.
I checked the dynamic options but was not sure where to start...
Can you tell me which option I should choose?