I think people are trying to make you fat.
But you just said "gain weight" without any further details, so I suppose fat does equal "weight."
Italmusc is right. Where did your expectations come from? My guess is they came from that impatient, unrealistic, fantastical part of your brain. If you're talking muscle weight, then a pound a month is FANTASTIC progress.
But if your goal is to become a lard-ass, well then, I suppose you should just start stuffing as much potatoes, pasta, and beer down your gullet as soon as possible. Preferably right before bed, or right before you blob out in front of the TV. ;)
Seriously tho -- do your spreadsheet, with 4 columns: calories, carbs, protein, and fats. This is hard. You will, gasp, have to use google! You will have to read labels! Do math! But until you do this, I submit that you have absolutely no freakin idea what you are eating. Until you know, you are a blind man. Get to work, cause no, this shit ain't easy. If it was, everyone would look great.