Check Box not working

Hi guys.

First of all i want to thank you for the plugin. Great work.

I got a problem when i want to add a check-box to my contact form. The complete plugin code is …

<p class="contact-input">[text* naam placeholder "Naam*"] </p>

<p class="contact-input">[text* achternaam placeholder "Achternaam*"] </p>

<p class="contact-input  last">[text* telefoon placeholder "Telefoon"] </p>

<p class="contact-input">[text* email placeholder "Email*"] </p>

<p class="contact-input">[text* kenteken placeholder "Kenteken"] </p>

<p class="contact-input last">[text* merk placeholder "Merk*"] </p>

<p class="contact-input">[text* type-auto placeholder "Type auto*"] </p>

<p class="contact-input">[text* bouwjaar placeholder "Bouwjaar"] </p>

<p class="contact-input last">[text* aantalinzittende placeholder "Aantal inzittende*"] </p>

<p class="contact-input-upload">Voeg foto toe:  [file file-744 limit:10000000]</p>

<p class="contact-input last">[acceptance accept-this-1] Vink dit aan als alle inzittenden de lunch willen nuttigen.*</p>

<p class="contact-submit">[submit "Verzenden"]</p>

But when i look at the page.. the chechbox isn’t there (screenshot)

I’d like to hear from you.

Thanks again, best regards.

https://wordpress.org/plugins/contact-form-7/