Default formular field is not returned in booking

In in my booking forms I have these fields:
https://www.bygadehuset.dk/reservation/

Fornavn:
Efternavn:
Adresse:
Postnr og by:
Email:
Telefon:
Antal personer:
Anledning:
Besked:

However “Antal personer” is not returned into booking system?

I have these settings in backend – hope you can help me clarify what needs to be fixed?

Formular field:

<div class="wpbc_booking_form_structure wpbc_vertical">
  <div class="wpbc_structure_calendar">
    [calendar]
  </div>
  <div class="wpbc_structure_form">
     <p>Fornavn*:<br />[text* name]</p>
     <p>Efternavn*:<br />[text* secondname]</p>
     <p>Adresse*:<br />[text* adresse]</p>
	 <p>Postnr og by*:<br />[text* by]</p>
     <p>Email*:<br />[email* email]</p>
     <p>Telefon:<br />[text phone]</p>
     <p>Anledning*:<br />[text* anledning]</p>
     <p>Antal personer*:<br />[text* Antal personer]</p>
     <p>Besked:<br />[textarea details]</p>
     <p>[captcha]</p>
     <p>[submit class:btn "Send"]</p>
  </div>
</div>
<div class="wpbc_booking_form_footer"></div>

Content of booked datafield:

<div style="text-align:left;word-wrap: break-word;">
  <strong>Fornavn</strong>: <span class="fieldvalue">[name]</span><br/>
  <strong>Efternavn</strong>: <span class="fieldvalue">[secondname]</span><br/>
  <strong>Adresse</strong>: <span class="fieldvalue">[adresse]</span><br/>
  <strong>Postnr og by</strong>: <span class="fieldvalue">[by]</span><br/>
  <strong>Email</strong>: <span class="fieldvalue">[email]</span><br/>
  <strong>Telefon</strong>: <span class="fieldvalue">[phone]</span><br/>
  <strong>Antal personer</strong>: <span class="fieldvalue">[Antal personer]</span><br/>
  <strong>Anledning</strong>: <span class="fieldvalue">[anledning]</span><br/>
  <strong>Besked</strong>: <span class="fieldvalue">[details]</span><br/>
</div>

The page I need help with: [log in to see the link]