I read about your schema plugin, installed it, didn't see any way to control ANYTHING with it, all it had was 3 check boxes, so I deleted it and now I have a bar on my slider and all posts and pages with a contact link above it.
The plugin seems to have permanently modified my css with out me knowing it.
How can I fix this?
If you look inside your screenshot, you'll see that the 'Contact' link has overflowed the menu. My best advice is to either re-organize the menu so that it has fewer items or to reduce the font size so that they all fit. Just looking at the HTML, I can't see anything that Schema Creator could have left behind.
(The black bar you're seeing is actually the bottom of the main menu so that it creates a "folded" look)
I didn't add any menu items and the size of the menu items comes from the CSS which I have not modified.
Site was fine before your plugin, and then its not WITH NO OTHER CHANGES TO IT OTHER THAN INSTALLING AND REMOVING YOUR PLUGIN!
If you would like I can give you an admin login so you can browse through the css rather than looking at dynamically served HTML....
But I sincerely doubt my BUG report is invalid.
The link for Official Products appears to be new. It is possible another team member may have added the link, but I can see that it has happened in the last few months based on that archive page.
There is nothing in the Schema Creator plugin that interacts with the wp_nav_menu menus hooks. The purpose of this plugin is to assist with adding structured schema.org data to content pages.
You can manage your main navigation menu through the WordPress admin through Appearance > Menus.