Eating carbohydrates at night is perfectly fine.
If one exceeds their caloric maintaence level, more than likely, the individual will gain weight. If one creates an energy deficit, preferably through cardiovascular activity/restriction of calories/weight training sessions, the individual will more than likely lose weight.
It all depends on one's overall calorie total that determines body composition, not the time carbohydrates were eaten. Carbohydrates have many anti-catabolic properties and should not be eliminated at any time of day. They can be very beneficial at night, bulking or cutting.
No need to restrict carbs at night. Stay away from high GI carbs at night. Total daily calories is more important.