Keeping a food journal is a great idea. It's a great way to identify and point out trouble spots. Not to mention keep ourselves totally and completely accountable.
Yes, a talk sounds like it is in order. You can assure him that you most certainly are eating enough throughout the day and would just like to eat a nice, healthy amount of food come supper time, especially given the time that you are eating.
As far as overeating at supper, perhaps try using a smaller plate, this way you don't have to worry about eating too much and emptying your much larger plate. It's a great "trick" that really works and keeps those portions down.
Good luck to you.