the form sent email tick and untick box etheir way

I have issues with wp 4.5.2 and contact 7 4.4.2 , the form send email tick or untick in both way it send email .
how is possible to fix this ?

<p>[text* your-name id:name placeholder"First Name*"] </p>
<p>[text* last-name id:last placeholder"Last Name*"] </p>
<p>[email* your-email id:email placeholder"Your Email*"]</br>[checkbox opt-in "Subscribe me to your mailing list9"]</p>
[acceptance acceptance-544 default:on] Check here if you accept these terms.
<a href="terms-and-conditions" class="info"> View Terms and Conditions</a>
<div>[submit id:mainbutton "CONNECT"]</div>

and contant 7 is on demo_mode: on
thanks

claudio

https://www.ads-software.com/plugins/contact-form-7-mailchimp-extension/