Jetpack comes with a built in contact form which is activated by default when you install the plugin. This means that when you use the short code
Deactivate JetPack’s Contact Form.
Go to the settings page for Jetpack by clicking the Jetpack link on the left hand side of your admin screen. Scroll down until you get to the Contact Form section and click on ‘Learn More’. This will reveal a ‘Deactivate’ button for you to click.
OR Use a Different Short Code
From version 4.1.2 onwards the Clean and Simple Contact Form provides an alternative short code for you to use. To use it simply place [cscf-contact-form] on your page to implement the form instead.