Prehaps you are living here now, but you need to repost your question under the state of Washington on Avvo so the proper Washington attorneys can answer your question.
The above is general legal and business analysis. It is not "legal advice" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts not reflected in the question. I am not your attorney until retained by a written retainer agreement signed by both of us. I am only licensed in California. See also avvo.com terms and conditions item 9, incorporated as if it was reprinted here.
Well if you failed to appear for a required court hearing while represented by a public defender, then a warrant may well have issued. In California public defenders usually do not appear for clients (pc 977). If a client fails to appear and is represented by a public defenders the public defender, who often
handles 100's of cases will often tell the judge he has not had contact with his client and the court will issue a warrant. Private attorneys have far fewer clients and maintain better and more frequent communication with their clients and agree to appear for their clients without having their clients appear in most misdemeanor cases. Obviously your case involves Washington law and my comments arent necessarily applicable to your case. Your best bet is to call the Washington public defender's office that represented you to find out what happened and if they will help you clear the outstanding warrant.