Joomla! frequently asked questions
I'm pretty new to Joomla, and my top nav bar has decided to double up - I can't figure out how to get it back to normal.
Some templates already have the code to display the Top Menu, you can check it in the Template Manager. Or try to disable Top Menu Module in Module Manager.
If you've called this menu twice (could be different or same positions). Just Disable one and that will fix it.