If the prosecutor voluntarily dismissed the charge rather than keeping the case open, the warrant should not be active. If the court put the file on inactive status due to your failure to appear, the calendar entries should not show a "nolle prosequi". From what you have told us you appear to have a dismissed case and an active warrant, which shouldn't happen.
As we are not able to investigate for you to find out exactly what is going on, you will need to check with a lawyer in the county where the warrant is pending.

