Ron's Authority is not giving bonus to magic defense.

in the description of the skill when activated. informs (+20% magic defense) will not put the change in status.
this is normal or is a kind of error?:(
http://imageshack.us/a/img268/5369/nv7m.jpg

http://imageshack.us/a/img203/5674/ga3l.jpg

http://imageshack.us/a/img837/6004/3xhv.jpg


please take this doubt.
thanks for listening.

thank you very much for your help.