Could my IE be redirected?

Several web sites consider my IE11 as if it was a FF. As example, toward the end of my Norton Community profile page is listed

 

Browser used for Last VisitMozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; MAARJS; rv:11.0) like Gecko

Well, I don't understand that...  I don't know how to  troubleshooting this. Why wouldn't it say my browser used last

visit : IE 11 ? As I only use IE. I know someone at a point installed FF in the past and it has been uninstalled sometimes ago.

Windows  8.1  IE11. 64. 

Help. Thanks