The Zip Code in the fields has a maxlenght of 6 chars.
Where can I change the maxlenght as our zipcodes are longer than 6. In the database it shows 24 so the maxlenght is not in there.
Found the solution. Just in case anyone needs to change it:
/administrator/components/com_jsjobs/views/company/tmpl/formcompany.php
line 338
/components/com_jsjobs/views/company/tmpl/formcompany.php
line 459