It is really difficult to comment on your condition without actually seeing what has happened over the last few months. Don't hesitate and ask your Orthodontist clearly why this is happening. The treatment might be well on course for all you know. Express your concerns to him/her and discuss at length when your Orthodontist is free.
Health Tips
Delay by a few months is common in Orthodontic treatment because of missed appointments, brackets coming off and various other reasons. This treatment involves a lot of mechanics and it is impossible to tell definitely the time period involved in treatment. Be patient and all will be good at the end.