In this article I show you how to remove the second 'contact form' header from the default contact form in Joomla without hacking your install. I'd seen a couple of videos on you tube that suggested one should alter the underlying installation. You can do this without altering the installation.
Just to make sure we are talking about the same problem. I am discussing the situation where when creating a default Joomla contact form, there are two headers, which by default will look something like the image shown. If this is the problem you have then it is easily fixed by adding a language override to blank out the second header.
Login to your Joomla console with the usual administrative credentials. Once logged in from the Administrative menu select
Extensions - Language Manager Now you should be in a menu labelled: Language Manager: Installed Languages
Just below this menu option you'll see a menu line with an option labelled
Overrides Choose this option, where we can override the contact form text (or any other Joomla text you don't like. To add an override simply press the New button on the top right. Once the Edit override dialog appears enter
COM_CONTACT_EMAIL_FORM into the Language Constant field and leave the Text field below empty.
Saved the change and ensure you see an information bar containing something similar to 'Language Override was saved successfully'. and then navigate to the contact form. If all went well you'll now only see one header; the "Contact Form" header should no longer be present.