What's the deal with that? Seems weird to have 2 at on school and 1 at the other. Aren't all the other conference series 3 games at one location?
The K-State- Kansas series has always been 2-1. Last year it was two at Kansas State and one at Kansas. Some years they have a forth game that doesn't count toward the standings.
Some schools have a format like that for a rivalry series so each fanbase can see at least one game at home. For example Texas State has one home game and two away games against U. Texas - San Antonio this year. Other examples include UT/A&M, UGA/GT, Nebraska/Creighton, and OU/OSU have kind of a cool setup where they alternate between Tulsa (1 game this year) and OKC (2 games). Not everyone does this though, and I'm pretty sure it only happens when the two schools are in-state and are relatively close to each other. That's why you don't see any 2-1 series between Kansas/MU, UT/OU, UGA/UF, etc.
Also, Kansas/Missouri does have a 4th game in Kansas City this year that I believe doesn't count towards the standings as cheapseats pointed out.