Why is the 7Sage Admission Calculator so far off from the LSAC/CAS version?

This may be a stupid question, I don't spend a lot of time in the discussions. But, for example, 7Sage lists my odds of being admitted to CU-Boulder with my GPA and predicted LSAT score at 79%, while the LSAC version lists just 42%. That's a huge difference. It looks like the data for 7Sage may be a little older, but that still seems like a steep drop-off. Any ideas?