Weird thing happened in my game. I leveled up my monk, but he was given the option to take "Imporved Evasion" as a feat.

I did not choose this, but noticed in the dialogue screen that my Monk has gained the ability "Improved Evasion" (he's level 12 now).

Does my monk really have this feat, as he's supposed to, for free? Or do I need to choose it next time I'm able? Will taking the feat now give me any added bonuses?

Klorow, according to the manual, monks are supposed to get Improved Evasion as a standard class ability at 9th level. It's interesting that your monk got a choice to select it as a feat, since that should, as I understand it, be only available for characters with 10 rogue levels.

Check your character's various character screens and see if Imp Evasion shows up in the lists of feats, skills, and other abilities.

When I levelled up again, it was already checked off. It must've been a tiny bug or something. No big deal.