After you file

The same thing happened to me.   I figured out a way to trick the system.   Choose the second option that says savings bonds.   Then put 50 for a savings bond.   Then it will give you the option to split the refund.  When i put in the amount,  I used the two accounts and the amounts I wanted in each account.  Then it told me that i was negative -50 and had to delete an account.  I then deleted the 50 savings bond and it worked.   its crazy, but its the only way to bypass it.   This is the first year I ever saw that.