I'm guessing it's because of the "trident" and "7.0" in the user agent: Mozilla/5.0 (Windows NT 6.3; Trident/7.0; Touch; rv:11.0) like Gecko
I've noticed a ton of sites that misdetect IE in this way. MS's attempt to 'improve' their UA string seems to have done more harm than good.
http://gs.statcounter.com/detect
Can you check if that detects your IE11 correctly?
I'm guessing it's because of the "trident" and "7.0" in the user agent: Mozilla/5.0 (Windows NT 6.3; Trident/7.0; Touch; rv:11.0) like Gecko
I've noticed a ton of sites that misdetect IE in this way. MS's attempt to 'improve' their UA string seems to have done more harm than good.