HUGE difference in EFC for my 2 college students - HELP!

I have gone through both line by line and everything is correct which is why this is so frustrating. I did not do the applications the same day. I did my older daughter’s app early last week and my younger one’s this past Monday. Because of the EFC, there are big differences in their projected aid…

Junior Daughter…

EFC $925

Stafford Loan Estimate $7500
Pell Grant Estimate $5545

Freshman Daughter…

EFC $5428

Stafford Loan Estimate $6500
Pell Grant Estimate $1045

This makes no sense. I am so frustrated