Multiple notification rules, yet more than one rule is applied

Multiple notification rules, yet more than one rule is applied

Hi, I have a drop down box with the aim that when an item is selected, it will produce a custom notification via email.

I set up the rule with in criteria section: Dropdown - Equals - "specific dropdown item".

I have 12 rules set up - it all works apart from Rule number 1 will always send a notification out as well as what ever is selected in the form.

Can you help?