I found that when placing a legendary item on my character in the hero planner I receive more stats than I should normally. It seems like I receive ALL of the "one of X magic properties" that are on the legendary items.
For eg. I equipped Strongarm Bracers. They can roll Dex, Int OR Str for its main stat, but, all 3 are added to my attributes. (Which would never happen in the game).
There should be a way to choose which "magical properties" roll with legendary and set items.
Just a thought.