Is US News playing random number?
On Rankings you need to look at each graduate program separately , there is no"overall GRADUATE RANK" for any college out there. . So Medical School, versus Law versus Business versus Science versus specific Engineering fields. If I remember correctly finance is very highly ranked for graduate school as is BME, and Medical Schools are very strong. Mechanical and Aerospace may be the stronger Engineering grad programs too, but CWRU excels as an undergraduate college for rigor in many areas.
For undergrad at Case–
(nursing, accounting, chemistry, physics, math, macromolecular, and some fields of engineering such as macromolecular engineering, aerospace engineering are especially very strong, and clearly BME is ranked well due to research opportunities at Cleveland Clinic and University Hospitals ).