Too many new pages opening

I seem to get one new page for every action carried out. When I select "All pages", I have a new page for "All pages" and then when I select the "Home" page, another new page opens for the "Home page" for me to edit. When I updated my edits and then select "view page", a new page opens for me to view the page. By the end of 5 mins I have 9 new pages opened. This has not happened before I installed the WPMU DEV plugins, hence I believe it could be a plugin issue? I do not know how to prevent new pages opening for every action I take and I do not want this to happen when a visitor comes to check out my website.