have you tried clearing you system cache in System > Cache then select all and click on the clear cache button at the bottom.
Then clear your browser cache with either a Cntl f5 or clear cache in your web browser tools.
Abantecart uses a caching system to deliver your pages faster and your web browser stores pages for the same reason, When you have changes - the best way to see if they are working, is to "force" the cache clearing.
Lee