Go to the file: class/members.php
line 321: in the get_query($p) function
change to
return $this->url.'&page='.$p.'&query='.$_GET['query'].'&by='.$_GET['by'].'&type='.$_GET['type'].'&sort='.$this->sort.'&order='.$this->order.'&byradius='.$_GET['byradius'].'&radius='.$_GET['radius'];
added an '&' to before page=