B767 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 60; Flight Crew Total 24000; Flight Crew Type 4000
Confusion; Human-Machine Interface
Aircraft Equipment Problem Less Severe; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance
Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem
Aircraft
Departing EWR we were assigned 6000. I pointed to ALT window and verified 6000. I was PF. As I approached 5700 I noticed throttles not coming back and FD still indicating a climb. I pulled throttles back; overshot 6000 and leveled at 6200. We noticed the altitude window read 7000. NFP called to verify altitude. We were then cleared to 7000.  No problems with ALT window. Then we were cleared to 7000 and I verified 7000. Then window changed to 8000 on its own. We wrote the aircraft up.
The altitude window worked correctly the rest of the flight.
A B767 flight crew climbing out of EWR reported two instances of the altitude alert window setting advancing 1000 feet above that previously set per their clearance as they approached their cleared altitude. Operation returned to normal after the two events. They wrote up the anomaly.