It’s not a two year grant. I corrected myself 
The federal government doesn’t award full Pell if you drop down to part-time. Your ~$5100 grant could have been reduced to part-time aid. I think that’s a reduction of 25%, or ~$1300.
What is the school saying?
This is your corrected post.
What is the total cost of attendance for you for this current academic year only.
And again I ask…what year of schooling are you in? First year? Second year?
Are you considered independent for financial aid purposes?