Fafsa corrections

Hi guys!! I got accepted into both University of Florida and Umass Amherst. I personally prefer UF because their rankings are much higher. However, today I was told by the financial aid counselor(UF) that I made a mistake by putting down graduate instead of undergraduate on my Fasfa. Therefore, I still haven’t receive my financial aid package. I just made the corrections but im scared that the aid will not come through in time since i have to commit by May 1st. Im also scared that my aid will be significantly less. If you know anything on how this stuff works, please let me know.