Radius Problem with Cisco WLC 5508

I'm using cisco WLC 5508 and I'm trying to authenticate users using Radius server. unfortunately i was unable to authenticate.
I just want to know why i'm seeing {username = '80006e446ad2'} in radius logs, its like a mac address when in  fact i don't have that configured. I've seen a lot of 12 characters as username change in every second. Please see attached for reference. Please take a look at the username value i don't know where it came from.
IMG_20161010_112642.jpg
Zen ValdezAsked:
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Craig BeckCommented:
Can you screenshot the WLAN's Layer2 page please?  It sounds like you have the MAC-Auth box ticked.
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Craig BeckCommented:
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