thank you
there are some mods in your loadorder
(such as "Wildcat", "EnderlBoundDagger", the "Enderal - ..." - mods)
that seem as if they could influence the perk.
(especially if they're not completely up to date with the latest patches)
they might leave scripts (or something) in your savegame
do you have a save from before you unlocked the perk?
in that case you could disable your mods and try enabling it without :/
(to clarify, I don't know if there's something inherently wrong with the perk;
there's nothing in the bugtracker about that, I can only make educated guesses

)