It may be because the time set on the watch is incorrect or the reference position of the hands on the watch is incorrect.
Try to receive signals manually to adjust the time.
Check the reference position of the hands on the watch if the time is still incorrect even after the manual signal reception.

The method of manual signal reception and checking the reference position of the hands are different depending on the model.
Refer to the instruction manual of the watch to make changes.
・For some models, you can also use the abbreviated instruction.

Instruction manual

http://www.citizenwatch-global.com/support/guide/manual.html