I think it’s because it is different FAFSA school years. January was part of the 2016-17 financial aid year, and you completed that form in 2016 when you a dependent. The Fall 2017 semester is part of the 2017-18 FAFSA year, and you are now independent. If the school closes the financial aid year on June 30, summer might be counted as part of the next financial aid year, so summer 2016 was part of the 2016-17 financial aid year and you got a Pell grant (which seems strange if that was the only one you ever received).
Go to the FA office with all your documents and have them map out your eligibility for you. How do they count summers? Are you a full time or part time student in the summer? Next fall? You need to be at least half time to qualify for FA. Are you at least half time? Keep asking questions until you understand.