If you are seeing something like:
then it is probably because you have hard-coded a link to the contact us form but used the wrong format. The link should use the mail form script and not be direct to the contact us form. It should be in the format of:
<a href="http://www.domain.co.uk/cgi-bin/mf00000x.pl?ACTION=SHOWFORM">Contact Us</a>
where 'domain.co.uk' is your actual web address and 'x' is your CGI script ID number (see 'Web | Network Setup').
then it is probably because you have hard-coded a link to the contact us form but used the wrong format. The link should use the mail form script and not be direct to the contact us form. It should be in the format of:
<a href="http://www.domain.co.uk/cgi-bin/mf00000x.pl?ACTION=SHOWFORM">Contact Us</a>
where 'domain.co.uk' is your actual web address and 'x' is your CGI script ID number (see 'Web | Network Setup').