Don't know if that is an error and while nothing stops you from taking two Keen Eyes it doesn't make much sense to do so.
Keen Eye (3) is permanent so you start with it in play and it can't leave play by any means. There is also no limit how often you can activate it. And activating it once also only gives you the bonus once, not twice if you have two of them.
You would probably be better if you spend thos 3 exp onto something else.
Don't know if that is an error and while nothing stops you from taking two Keen Eyes it doesn't make much sense to do so.
Keen Eye (3) is permanent so you start with it in play and it can't leave play by any means. There is also no limit how often you can activate it. And activating it once also only gives you the bonus once, not twice if you have two of them.
You would probably be better if you spend thos 3 exp onto something else.