I hope the rpi doesn't mean much in softball. It shouldn't. It makes no sense.
#13 Oklahoma
#22 Baylor
#24 Kansas
#28 Texas
#88 Texas Tech
#113 Iowa State
#139 Oklahoma State
Now, Texas swept Kansas at Lawrence. That challenges the rpi. Texas Tech took two of three from Kansas in Lubbock. Kansas did sweep OSU in Stillwater. At least, that series did go according to the rpi.
Curiously, Baylor, #22, did lose one in Stillwater.
Kansas hasn't won a game all year against a good opponent. The only reason that I can see that they might be ranked so highly is that they did go to Florida for their preseason schedule as opposed to California. Kansas was 11-2 in FLorida, losing to Florida and Chattanooga. But, they were beating teams like Liberty, Mercer, Illinois State (twice), Stony Brook, Sienna, North Florida, LaSalle, and Stetson. They did take two of three from Chattanooga. They really played nobody other than Florida, and lost that one. But, they played in Florida. The rpi really ranks the SEC teams highly.