Primefaces pick list target is always empty - jsf

Question

I have a pick list component and I have 2 lists, the first has data from my database and the second is a DualListModel and I have a button to transfer between the pick lists, when I transfer data nothing happenes the source in the DualListModel stays empty.
Here is my JSF code:
<p:pickList id="a" value="#{mbInstructor.model}" var="pickQ"
itemLabel="#{pickQ}" itemValue="#{pickQ}">
<o:converter converterId="omnifaces.ListConverter" list="#{mbInstructor.fullList}" />
<p:ajax event="transfer" listener="#{mbInstructor.onTransfer}" update="msg" />
<p:ajax event="select" listener="#{mbInstructor.onSelect}" update="msg" />
<p:ajax event="unselect" listener="#{mbInstructor.onUnselect}" update="msg" />
<p:ajax event="reorder" listener="#{mbInstructor.onReorder}" update="msg" />
</p:pickList>
And here is my methods in the managed bean:
private List<Question> fullList;
private DualListModel<Question> model;
public List<SemesterExamQuestionForm> getAllQuestionForms() {
GeneralFacade facade = new GeneralFacade();
return facade.lstSemesterExamQuestionForm(getCurrentStudySemesterExam());
}
public void onTransfer(TransferEvent event) {
StringBuilder builder = new StringBuilder();
for (Object item : event.getItems()) {
((Question) item).getQuestionTxt();
}
FacesMessage msg = new FacesMessage();
msg.setSeverity(FacesMessage.SEVERITY_INFO);
msg.setSummary("Items Transferred");
msg.setDetail(builder.toString());
FacesContext.getCurrentInstance().addMessage(null, msg);
}
public List<Question> getFullList() {
return fullList;
}
public DualListModel<Question> getModel() {
if(model == null){
model = new DualListModel<>();
}
fullList = getAllCourseQuestions();
model = new DualListModel<>(new ArrayList<>(fullList),new ArrayList<Question>());
return model;
}
public void setModel(DualListModel<Question> model) {
this.model = model;
}