yes I am positive..
do you have different styles installed?
In which style did you paste the template?????
are you sure you have modified the template in the style you are viewing?
you can check the template if you go to ACP
vbulletin options -> general settings -> Add Template Name in HTML Comments -> YES
then go to the page and view the source code in your browser.. (after refreshing)
You should have the template name between <!-- start template name:xxx --> tags