What is it with 12 seeds winning so often?

It's one of the most evenly matched games.

You have borderline-ranked teams facing the best of the mid-majors/conference champions.

12 seeds are usually small conference championship winners, and most of them are way better than a 12 seed and should be around 6 or 7 seed.

Talent gap is negligible between middle-of-the-pack power conference teams and mid-major champs.

I feel personally it's because that's the perfect range on the curve. 12 seeds are usually very underrated small schools, because well, they're small schools. 5 seeds are usually the more overrated teams, in OU's case(who was terribly over-seeded) because if conference rep. Usually teams on the cusp of being alright but not bad enough to be a double digit seed so they get the benefit of the doubt.

I picked all 4 12 seeds. Should be 3/3 so far. frick NC State

leggoo SFA tomorrow

Like others have said, its usually a mid major teams thats pretty damn good vs a major conference team that was decent or over rated because of conference