Hello, if u read the user's manual, there is an option to resync the hands. Goto the units mode ( Press the middle button, and then twice in the center of the screen, so that the digital display shows either 24h Cm or 12h... u get it ) Once in that press and hold the middle button for 5 seconds, until the display shows SYNCHRO. Then use te top button to adjust the minute hand and te bottom button to adjust the hour hand, and bring them both, one on top of the other, over the 12 o'clock position. Once this is set, press the middle button again. This should to the trick.