Financial Aid/ Cal Grant A

Hey ya’ll,
I go to UCI and I am a California resident. I get my tuition paid for fully by financial aid. Last Spring Quarter I took 8 units instead of the usual 12. It says on the financial aid website I need 6 units in order to have financial aid reimbursed to me, which is why I though taking 8 units was safe. But now I have this $2,000 fee on my zotaccount labeled as “Cal Grant A”
I have to wait til Monday to call and confirm with the office, but do ya’ll think it’s because I took 8 units instead of 12?