Hello,
as FRW pointed out, that's the behaviour of the default template. If you don't like it, you should write your own template, including the .php file that overrides the header and footer methods of the TCPDF class.
A quick alternative is to directly edit the class, opening include/tcpdf/tcpdf.php and editing
public function Header() {
and
public function Footer() {
however this is not the recommended method because when you upgrade DaDaBIK you loose your modifications.
Best,