Plugin broke menu links | Peter's Login Redirect | Forum

After installing the plugin, all of my main menu links redirect everyone back to the homepage. I immediately uninstalled the plugin but this continued to happen. Then I renamed the plugins folder in my wordpress directory and it still continued which means there's leftover code somewhere else. Now guests can't get to sections of the website. However, if I paste the url of the page into the browser bar it loads fine. I've tried creating new pages and copying page data over but they are still inaccessible from the menu.

Do you know how I can fix this? Your help is much appreciated.

Thanks!