[NTG-context] Strange link on pragma site ?

Dear users, it seems that I have some problems with links to magazines. If I go to mag-0000 at http://www.pragma-ade.com/show-mag-1.htm on bottom right there are PAGE 1 OF 10 and link 'previous' If I click on 'previous' I will go to http://www.pragma-ade.com/show-mag-10.htm (mag-0009) and on bottom right appears PAGE 10 of 11 mag-0009 is not last magazine, so from first I jump to last-1 . Is it right ? Does anybody have this 'problems' ? thanks luigi