The Big East is in big trouble in the efficiency ratings. I will go back and check at some point, but I do not recall the huge variances between RPI, which is a simple wins and losses assessment of teams and their strength of schedule, and the efficiency ratings. For example, Tennessee and Kenucky are 55 and 56 in RPI, and 22 and 24 in KenPom. That means that Tennessee and Kentucky are struggling against weak schedules, but light up the teams they beat so it's all good in efficiency-land. Iowa is 42 in RPI and 18 in KenPom.
UConn is the other direction, 4 in RPI, but 11 in KenPom.
It is possible there is just a glitch or some kind of "house effect" in KenPom's model that is creating this dynamic.