I created fileds in datasource of a section. At first, I used only those fileds from that section to make sure that workflow will run smoothly before put it back into the section. Then, I created the section in the form. I then put those fileds into section. However, there are duplicated fileds occurred in the form. I cannot make duplicated fields, which were created before, disappear. This fileds are also parts of K2's task action.