I am sure that you have come across this issue before with Joomla title showing twice for example testing site testing site on the browser. This can become annoying and there is a very simple solution. I have read many forums and blogs on how to fix this issues. I decided to add it to my blog.
Log into your Joomla backend and navigate to the global settings, here is where you enter all your global settings for your site including the meta tags etc. If you have globle settings entered here, you don’t need to add them again anywhere in your Joomla site especially if it is pointing to your frontpage or homepage.
What happens is that some enter a title under Menus > Main Menu > Home this causes a double up on your title and when you look at the top of your browser you see this very annoying double up of the title.
The solution is simple click on Menus > Main Menu> select Home > to the right, you will see Parameters (System) select Show page title: NO and make sure that title is blank. This should fix your problem. In the chance that it doesn’t then I am sure that you have entered somewhere another title that it is pointing to your home frontpage. If you have any questions drop a line 
