computer music tutorial limiting

hi,i am following a tutorial in January 2015 cm magazine regarding mastering
it is to do with ma ster limiting techniques
I drop a tune from the cm tutorial folder onto an audio track,and used the a.o.m. invisible limiter like they do,exact same settings.
computer music get 3-4 db gain reduction,im only getting 1.9db reduction
I def. have used exact same settings,and cm are using Cubase also
anyone got any clues as to why my gain reduction is not the same?

ok I got it sorted!

any links online?.. would not mind checking this out.