I didn't apply to UCSD. Nevertheless, I would double check your information, just in case. I had a problem when I tried logging into one of my accounts. I was copying and pasting the information. I typed it manually and it worked.
If all else fails, call or e-mail them:
Phone: (858) 534-4831
E-mail:
AdmissionsInfo@ucsd.edu
I hope it works out for you!