Mailchimp shortcode double opt-in

Hi,

When I add the below short code, it will send a confirmation email the inbox before the subscription. How can we stop this?

[av_mailchimp list='' double_opt_in='aviaTBdouble_opt_in' on_send='' sent='Thank you for subscribing to our newsletter!' link='manually,http://' color='av-custom-form-color av-light-form' hide_labels='aviaTBhide_labels' custom_class='' av_uid='av-9x3o8k']
[av_mailchimp_field id='0' type='text' check='is_email' options='' label='Email Address' width='element_half' av_uid='av-9m7vas']
[av_mailchimp_field id='av-button' type='button' check='' options='' label='Subscribe' width='element_half' av_uid='av-9hku6k']
[/av_mailchimp]