It seems wordfence has troubles recognizing msnbot, in my "humans" tab I see:
United States United States visited http://paleosmak.pl/o-mnie/
6 hours 31 mins ago IP: 157.55.35.113 [block] Hostname: msnbot-157-55-35-113.search.msn.com
Browser: BingBot version 0.0
Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)