Columbia’s transfers are generally to the College of General Studies, which is an entirely different admittance structure from the other two colleges, Columbia College and Columbia SEAS. It is specifically set up for nontraditional students, which is a very cool thing. So it really can’t be compared to regular admission stats for other Ivies (more similar to Harvard Extension, though my impression is more assimilated into regular CU class structure than HE is, though I could be wrong.) CGS also doesn’t offer the same financial aid structure as the two other UG colleges of Columbia. CC and SEAS have very few transfers, as retention is very high.
Offering this information without judgment, but just to clarify this.