What happens when you enroll in two different colleges, and forgot to make the adjustment needed on the website?

Hello! I am a student in California. While I was attending a community college and a CSU I forgot make an adjustment on the FAFSA website.

I talked to the financial aid office on my college, and they instructed me to contact the office that distributed the grant. I tried to and got no response.

Later on I was informed that I need to repay a portion of the financial aid I was given for BOTH colleges rather than just one. I'm wondering if that's the typical process, or just a misunderstanding on my part.

Thank you for reading this.