I don't know about it being "so much lower." Probably what happens is that an applicant has attended two or more schools, enrolled in a course somewhere else, etc. The college or univeristy that you have graduated from, or will graduate from, has their own method of accepting outside credits and interpreting grades and this all plays into your final gpa from that institution. Unlike your school, AADSAS is not concerned with whether class X can be used to fulfill your requirement for class Y. They simply inventory all of your grades and calculate your gpa. You have to remember that sometimes they convert your quarter hour credits to match your semester hours (which is what happened to me) and this can alter your gpa. Keep in mind that your AADSAS stats are merely points of reference for dental schools, which have access to your transcripts and can examine things for themselves should there be cause for concern.